A 40d nova isn't nice to have? Seriously, though, I agree that a diverse party is an ideal D&D at least attempts to encourage. There should be some synergy among the party, in any case, support classes like the Warlord, though, particularly highlight that.
Well, there's always that question of whether or not you wouldn't just be better off 95% of the time with a whole slew of wizards! I mean its a pretty monstrously nasty alpha-strike! We concluded back in 1e days it was pretty much true even then, but 'classic' D&D did have some built-in restrictions that made it tough to do (no casting unless you're on a stable surface was a big one).
But not necessary nor even that accurate. 'Support' works just as well, for instance. Just like it might be easy to say 'Striker,' but 'DPR' is just as easy and conveys the laser-focus some 5e DPR classes have ('Strikers' had a few other aspects to the role, such as mobility or discouraging counter-attacks, that aren't true of all 5e DPR classes).
I don't see it as a matter of 'accuracy', its an established term which carries the concept. 4e didn't use the term 'support', because not all leaders are 'supporting characters', many are actual front-line 'go ahead of the troops' type LEADERS (others aren't, but its a term of art, it doesn't have to evoke every antecedent exactly). I think Striker perfectly adequately conveys the idea of 'focused attacker' quite well. 'DPR' is a technical term, and not all strikers achieve their ends by raw high damage output, at least not directly. I think Striker (and Defender and Controller) work pretty well. I've heard a lot of alternative terms bandied about, and none of them really improve on those.
'Less flashy' might be fair.
Different. I don't expect to find that magical and mundane means are going to be the same. Maybe magic is often more flashy, but it could also be more subtle, etc. It could even be just plain better in certain respects, but D&D kind of eschewed the possibility by making casting cheap. So we're kind of stuck with putting some limiters on it and accepting fairly fantastical 'mundane' things to get some parity. Its OK, that's D&D for you!
Regardless of how much I agree with other ideas of the person saying it, "D&D is not for you, go play something else," just isn't constructive. It's as dismissive as what he did to you up-thread.
5e is meant to be for all fans of D&D.
I know that's an almost painfully cutesy, kumbaya, line, but it really would be good for the game if the community could rise to that level.
I'm not saying anyone should 'go play something else'. I'm just saying that there are games which EXPLICITLY match Steeldragon's idea of what D&D should be. My guess is he has a passing familiarity with that system, by reputation at least, and so I've conveyed the idea, Ars Magica really is "magic is best", and by contrast D&D isn't (though one might wonder about 3.5...).