Yes, but there's no reason why the two can't happily be used side by side.
There's a difference between a mechanical advantage and an advantage handed out by DM fiat. If someone gets +2 to hit because of flanking, it's obvious, and no one can argue it. If someone says something witty and the DM says, "Cool, have an advantage," that's less black and white.
Sure, but who wants a completely codified system for social interaction? Say something convincing, get a +2 on that Diplomacy check.
The combat swiftly degenerates into people needlessly showboating against mooks, and after a few rounds, the whole thing is frightfully dull.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.