If you change the implied setting, face it you're not really playing the same game.
The implied setting has changed with every new edition since the beginning of the game.
In Basic, not all chromatic dragons were evil, and the only metallic was gold.
In 1E, there was no such thing as Baatezu or Tanar'ri.
The default setting of 2E was Forgotten Realms. It was Greyhawk in 1E and 3E. It was "The Known World" (which sort of became Mystara) in Basic.
Vecna was a dead lich in 1E, a demigod in 2E, and a god in 3E.
Numerous archfiends vanished or appeared between editions.
Only humans could be paladins until 3E.
Orcs changed from lawful evil to chaotic evil in 3E.
Kobolds didn't used to be reptiles related to dragons.
Half-orcs, monks, and assassins ceased to exist in the default setting from 1E to 2E, and returned from 2E to 3E.
Psionics
completely changed, not only in mechanics, but in flavor.
If you don't care for the implied setting changes we've heard about in 4E, that's your prerogative. But to claim that this is the first time such things have happened is simply inaccurate.