Ok, I'll play.
Ok.
Umm, that's new. BECMI allowed you to go to level 36 and beyond. AD&D had no upper limit to progression. The 20 level limitation was a 3e addition.
Except now, those stats do entirely different things. Saving throws for example. And, the scale is entirely different as well.
Ok.
Well, let's see. In 5e, I start with Max HP and increase in fixed increments. Up until 2e, you died at 0 HP (although the optional "death's door rule obviously existed". In 5e, you don't die unless you take your Max HP in damage beyond 0. You have multiple chances to not die purely on your own. Plus, it's a relatively simple action to stop you from dying get you back on your feet. But, sure, HP haven't changed.
Ignoring, of course, that race=class in some editions of the game. The class list has changed from edition to edition. And, let's face it, you cannot possibly be serious that a 1st level OD&D Fighting Man is the same as a 1st level fighter in 5e.
Umm, 9 levels of spells is a 3rd edition addition. Clerics only went to 7th prior. The spell lists are completely different. In Expert D&D, for example, a cleric had a choice of 6 spells (IIRC) per spell level. That was it. Never minding things like at will casting, and all the other casting changes over the years. But, sure, if we ignore all the differences, they look pretty close.
Except in earlier editions where I didn't. Percentile dice for thieves, for example. And, of course, no die rolls whatsoever for skills or whatnot prior to 3e because skills didn't exist. Everything was basically ad hoc, DM's fiat for determining success. Want to jump across a ditch? Maybe I make you make a petrification saving throw. Why? Because it's a nice number.
Well, now, that's true. Of course, that's true of a lot of games.
Ok, no one said it was difficult to learn, so, I'm not sure how picking a bunch of newbies with no RPG experience means that every edition is very similar.

But, hey, whatever floats your boat.
Try this one on for size then. Try running a Basic/Expert game with your group. Just hand them character sheets and don't explain anything. See how far they get.