Let me start by clarifying "drift". 'Drift' is the process by which a playgroup, consciously or unconsciously, moves away (drifts) from playing the game according to the rules as written (“RAW”). Other terms used are “vanilla” (RAW), the opposite of this may be many things, “pervy” is one of them. House rules may fill gaps or override RAW - they would almost always be 'drift' as well (unless campaign-setting specific, possibly).
I'm not saying that drift is a good thing or a bad thing. I have, however, experienced much frustration with AD&D 2 and the standard rules. From what I gathered from other groups and our friend the internet, this was very very common. Many considered (parts of d&d to be 'bad design'). I'm also not interested in whether this is actually true or not. My question is:
Given your own experiences and general community feedback: are people 'drifting' as much in D&D4 as in earlier versions?
The questions of why/why not etc. I'll leave to other interested parties.
I think a non-subjective, non-community answer is possible, though it might require the marketing / customer service department of a certain RPG company. I'll change it to CW if common perception indicates it should be.
Note that I'm interested because I, as a customer, would be more interested in serious investigation of (purchasing) this game if less drift occurs: as a RPG enthusiast / theorist I also have my reasons.