I don't want to start a war since I know how strongly you feel about 2nd hand equipment vs. new , but in the interest of fairness I thought I should point out that, while your statement is certainly true, the opposite is also true.
I never said it wasn't.
looked through the Waverunner's manual and although, without a doubt, it has some great analysis tools - my entry level scope has a single-shot sampling rate of 2GSa/s; acquisition memory of 28M points per channel; vertical resolution of 12 bits when >= 5us/div @ 1GSa/sa; vertical sensitivity to 500 uV; time base setting to 2ns; and up to 65000 time-stamped segments.
Well, I have the smallest Waverunner model (LT 224 with only 200MSa/s and 100k memory, but the better models go up to 500MHz, 1GSa/s and 2M memory, and the Waverunner 2 goes up to 1GHz, 4GSa/s and 8M), but it still offers 4 channels, a vertical resolution of up to 11 bits at all time base settings, a time base from 1ks/div to 1ns/div, a whooping 400 time-stamped segments (due to the relative small memory), automatic measurements (average, max, min, std deviation), analog persistence (green/color graded/heat map) with history (up to 4000 acquisitions), advanced FFT (power averaging, power density, real, imaginary) on all acquisition points, histogram (up to 2 billion events) and 18 histogram parameters, Pass/Fail (up to 5 parameters), digital filter (user configurable), Power Measure Analysis (Power Device Analysis, Modulation Analysis, Line Power Analysis), Hard Drive Failure Analysis, advanced jitter/timing analysis, daisy-chaining of up to four math functions, zoom (much more responsive than on the DS4000, apparently), GPIB/serial/parallel/VGA ports, 512MB Flash hard disk, optional Ethernet port (via a network card that is essentially unobtainium), large 8.4" TFT, really good Windows software available from leCroy for free,...
Not bad for less than half of what a new Rigol DS2072 would have cost me ;-)
But don't worry, I'm certainly not suggesting that this is a better scope for a beginner (most of the options are worthless without the appropriate understanding of what they do), or that this is a better scope for everyone. But it's an example that 'old' doesn't necessarily mean 'slower' or 'inferior' (and gave me a chance to show off a little after you started it with your Rigol's specs ;-))
But that doesn't alter the fact that some new entry-level gear can offer features (such as massive amounts of memory) which would be hard-pressed to find in older gear.
You're right with memory of course (memory is cheap like chips these days, but in the past has been painfully expensive, especially fast memory required for sampling memory), but that's probably the biggest advantage (aside from a smaller size of a current entry-level scope). In terms of raw performance, there isn't necessarily an advantage with modern kit (like the example of the Rigol DS4000 zoom I mentioned) Of course there's other stuff like USB support which is definitely handy for a lot of things. Older devices usually require GPIB, and even a good Chinese GPIB-USB adapter (Beiming S82357 or F82357) costs a bit of money.
So it's not that cut and dried.
I never said it was, and I certainly won't suggest that 2nd hand is always better than new entry-level.
However, the thing is that nowadays beginners often only consider new entry level scopes (look at all the 'what scope should I buy' threads, where the contenders usually are Rigol DS1000/2000, Agilent DSOX2000, or some cheap Siglent/Hantek/Uni-T scopes). My point is that in addition to a new scope, it is worth at least considering the alternative of a 2nd hand midrange/high end scope (I would not necessarily recommend old low end scopes, unless the price is really good), as in many cases it offers either more bang for the buck or a lower price for roughly the same bang.