*CHOKE!* There is a term for this that rhymes with Full Wit... In my highest level 3e D&D game, where the player's characters ended up at between 18th and 19th level the highest stat was a halfling rogue with a 24 Dex. The dwarf fighter had a 20 Str and Con, not including buffs from the wizard, who had a 19 Int. Not a 30 in sight. Maybe they are required in your game, but none that I have played in, run, or even witnessed. The major change is that you don't need wishes anymore, you get better abilities with experience. 3.x is also the first time I ever bothered running a game past 10th level.
The Auld Grump