The clone in the video appeared faster than the original JBC which is hilarious.
I'm not sure which video you are talking about, but I comment anyway
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JBCs performance was greatly mystified because no other brand could get close to it (except metcal). But I think the reason is simply no-one tried hard-enough. The big brands divided the market, they get their profit share, why invest into research?
Then Chinese t12 clones came, as well some DIY stations (unisolder and a few from youtube) and original developments like ts100/ts80. They show good performance. Looking at schematics I don't see any "know-how". It's just a pid-controller. For a soldering station, it doesn't need to be fancy, nor to be super-fast or precise. An STM32 with built-in 12bit ADC seems to do well. So, just a mcu, a power supply, a mosfet and a display is that all is needed.
So, I don't see why a Chinese clone cannot compete with big brands. Esp., if overshooting is allowed
. I'd say Chinese companies have an advantage because they have much more freedom. Say, they don't need to supply service and spare part for next 20 years, they don't need to comply with some standards that may not be of interest of most customers, etc. They can experiment with UI, with graphic displays, rotary encoders etc. Big brands either cannot do it, or afraid of it so they don't piss off existing customers.