BryonD
Hero
I think this goes too far.5e didn't do much different than past editions, I agree. But people loved D&D for 40 years, there's a reason it is still the great roleplaying game in the world; whatever formula Gygax hit on all those years back still works. For what it's worth, WotC did try a radically different approach to D&D with 4th edition, and it created problems. Lots and lots of problems, so they went back to what they knew was safe ground. I find it impressive that they were able to distill elements from all the editions and blend them together. It sounds simple in theory, but in execution, i think it was rather tricky.
3E was often called the "Herofication" of D&D back when it came out. And through the historic prism of post-4E, 3E certainly looks close to the prior editions. But it was a radical departure all its own. Gygax (and team) had some truly brilliant insights. But early D&D was fraught with issues as well and every game I ever played in was different because of the wild concoction of house rules. And there is nothing wrong with house rules. But event through 2E, D&D NEEDED houserules. (And no offense to those few groups that played it straight, I've got no dispute with your as-is love or the complete and honest truth of that. I'm speaking to the broad "people loved" and "the great roleplaying game in the world" comments.)
A lot was learned from D&D. But those things that were learned were being implemented in other games. D&D was still the name brand of RPGs. So clearly that held sway. But fi you loom at those 40 years of love, you can break it into four broad periods.
1) D&D is basically the only game in town
2) D&D is slowly, but increasingly losing ground to other games, at least to the market of options if not to any one game
3) The 3E / D20 / OGL era
4) 4E
Now we are starting in into the 5E era. And it is certainly a huge turn back from 4E and also clearly not a turn back to 3E, but beyond that into the roots of D&D. So there is clearly truth in your point.
But it still builds and learns from a lot of other games that have come since. It is very much a modern game.