Obryn
Hero
No, the rules are still defined to serve the game, 100%.The divergence comes when the cart is put before the horse, when the game is designed to serve the rules instead of the opposite.
If a player wants to play a high-powered race, there are only a few reasonable approaches to it.
(1) The Savage Species route, which is kind of insane and which I'd love to hear justified in any kind of simulation sense.

(2) Level Adjustments, which are a pure intra-party balance kludge, and which break down any time you involve spellcasters. This showed up (IIRC) in the FRCG, and was greatly expanded by 3.5.
(3) "Just play the monster" - as in, take it right out of the MM and drop it into play. Which is a little odd to me, since it assumes that all monsters are basically identical in ability to one another. (4e supports this with the Companion rules in the DMG2, if you're interested.)
(4) You get a powered-down monster, revised to be suitable for a PC. This is apparently 4e's default, if you take the back of the MM as suitable for player use. Other than minotaurs, I can't think of another actual published example.
(5) Don't allow it. This was, basically, the advice in the 1e DMG.
(6) Make something up. You don't need rulebooks for this one.
In all of those cases, the rules are serving the game. And, in particular, they're largely concerned with balance - either intra-party (so the minotaur fighter doesn't overshadow the dwarf) or game-based (so the DM knows appropriate challenges to throw), and usually both.
Why would this be the game serving the rules, instead? They're just a lot of different paths towards the same basic goals.
-O