What bean is talking aboot is a completely different animal; current demands were much less as we didn't have ESCs that could pass the high surge currents a modern multirotor ESC can. Steady current draw was high, but surge current is another thing altogether. In helis and planks, you have inertia on your side. With acro and race quads, you are fighting inertia every millisecond.
Circa Mid 90's we were using the first of the Brushless motors from Aveox and Pletenburg and pulling 2000W plus from the NiMH packs for F5B/D which is why we tested the available connectors, best AVAILABLE option here was 4mm bullets. Electric Helis were just about unseen due to flight times from the battery technology. With the battery limitations of the time local non F5 contest classes were typically sub 80A draw on 7 cell packs so Deans were still a reasonable option but it was a mix of Deans and 4mm bullets.
You need to stop inflating what the needs of Quads are, the peak currents on my 3kg Electric Helis with 6S 5000's doing Acros will dwarf the typical 800g Quad loads let alone those running 5kg 12S 5000's. Fairly 'normal' to see XT90's or 6mm bulets here.
Current F5B 'Gliders' are running circa 3-5 second bursts at about 3000W. SPACE is why they don't generally use XT's the plastic shroud and wire lead in and out, you need a shoehorn to get the packs in. There is simply no one shoe fits all!
EDIT:
And yes, being starved for current for a few milliseconds can make a noticeable difference in an acro quad; it's not just your reflexes that matter here, but those of the processor in the flight controller. It does have reaction times that fast, and if the voltage sags instead of pushing a fast change in multiple ESCs at once, that turns into oscillation in one or more PID loops which ultimately becomes a wobble the eye can see, and lag in response you can "feel" when flying FPV.
/EDIT
The difference is in the logs... and I had years of log files showing voltage sag and surge current differences between the two on my acro quads; which proved what my experience racing dirt oval made me suspect all along: Deans' don't perform like XT60. Period.
I'm done arguing... Like I said; I used to swear by Deans', now I swear at 'em. They're a blight on RC.
mnem
Just say "No, thank you."
You are completely WRONG on this! Raving and heaping more generalized sweeping and emotively written 
with no foundation about Deans Connectors while considering only one narrow use case while making a definitive 'demand' for non use is DUMB. Use of the 'appropriate' connector that delivers extreme reliability is what is important and has ZERO to do with brand A or B!
And while I am at it using a fairly basic spade type connector on your e-bike while preaching XT supremacy is kind of 'interesting' 
All you show here is what you don't know, bean. I've been through this over and over with non-acro/non-race flyers, and you just don't WANT to understand. That's fine.
What I can tell you is, if you go to any event/park/model airfield where they're actually racing quads with Deans' on your rig, they'll literally laugh you out of the pits. Same with acro flyers.
You seem to think I know nothing of Helis... they were what I flew before I got into quadcopters. And no, you have no idea how those have evolved since you used to fly, either; it is obvious.
Today's multirotor aircraft are doing amazing things... and they are doing it because the amount of
instantaneous current they can pass through the power system has evolved non-linearly over the last decade. Literally an order of magnitude greater than what you are familiar with.
YOU are the one who's wrong here, bean. I literally don't have enough time to fully educate you either... this is more than a decade's worth of knowledge earned the hard way working with the people who make the damned things. If you actually bother to dig deep into it and educate yourself, you'll find out that
what I'm talking aboot is common knowledge among those who do race and fly acro quads.
Just like the disagreement I had with C aboot how these ESCs actually work; these are not just a simple H-bridge speed controller operating with fixed timing anymore.
They are much more complex than any ESC you ever used on any plank or Heli you ever flew, and they literally cannot fly the way they do with the kind of ESC you are familiar with. Those are just plain too slow, too stupid, and cannot pass enough current fast enough to do the job.
All the really cool innovation in RC over the last few generations has been driven by the demands of these craft; the sophisticated telemetry, ultra-low latency RC protocols becoming the new minimum standard, HD FPV and HUD, even process control based on the input from that telemetry... it is all trickle-down from the boom in FPV multirotors.
As for the spade connectors... who fucking cares...? This is not a electric motorcycle; this is a 250W booster motor with VERY low demand. It draws a 2AH drill battery down in ~15-20 minutes; and that is a 4-5 yr old pack that is nowhere near optimum anymore. I'll let you do the math.
The spade connectors, BTW, are what come in the kit; they are clearly adequate for the load this kit is intended to handle. I just recycled them as they work very well with the connectors in the battery itself. The OEM main wiring is 14ga, which is why the jumpers wired to the 2nd pack are 16ga; there is no need for more.
EDIT: Okay; that all does sound a bit condescending... and maybe there is a bit of that tone. I'm sorry, I don't mean to be that way. Just... how would you feel if I told you everything you know and have learned the hard way aboot making coffee is wrong, irrelevant or BS just because you cannot distill it down into a few sound-byte-sized sentences...? You get tired of having to argue stuff that you know is right and had to learn yourself the hard way with people who just won't admit that what they already know
does not apply here.
I've many times conceded that you know a whole lot more aboot the science and art of how to make somebody a good cup of coffee... mostly our differences arise from A) I just can't be arsed to roast & grind every pot fresh and 2) I grew up on ranch coffee, and as a result any coffee that hasn't been "fully cooked" doesn't taste right to me.
That last point, BTW, is a disagreement that has been argued back and forth in countless forums over the internet over the years; it is a discussion I've seen and been part of at least a dozen times going back to useNet days.
/EDITmnem
*goes back to doing things that are actually interesting*
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