As I understand your post, "Balance" and "Streamlining" brought 3rd ed., 3.5, Pathfinder?
Chiefly, yes. But not solely. Balancing means, among many things, that they used equal XP progression, they gave Skills to everyone, they made features accessible to every class, etc... all in the name of balancing them, even if they didn't pronounce it out loud. This can also be understood as drifting away from the classic party composition and basics (you shoot, I hit, he casts, she picks locks, etc...) into a "everyone should be able to face up against the exact same challenges" mentality. And to me, this was the literal end of ROLE-playing. After all, what does role mean, if everyone can excel at the very same challenges? You no longer has a Thief whom you have to drag around solely for his skills, nope, he is automatically a badass ninja-tier slayer who can dish out damage faster than a railgun (in mmospeak, its smthg called DPS?).
Agreed. Though 3.0/3.5 I also like because BUILDS. In AD&D 2nd Edition, and dual-classing aside, all we are doing is leveling a template.
I'm a purist so I could never get into anything other than 2e, but for all I know, builds could be great.