Glyfair
Explorer
I think there is a lot less houseruling D&D these days, but I think it started with 3.5. Part of it has to do with what we consider houseruling. For example, I don't consider playing with the skill challenge mechanic to be "house ruling" since it seems to have been intended as something flexible.
Dykstrav has hit on some other reasons.
You didn't see people houseruling things like whether a gnome could be a paladin. The assumption was that all races could be anything, and weren't limited in their advancement. Much more common houserules were that certain races couldn't be certain classes, and that was mostly in the early days.
There also weren't too many "unplayable" parts of the rules set. Some people would dislike a certain part of the 3E and make a houserule, but you didn't really see "unplayable" parts of the rules set. Some had problems with Attacks of Opportunities, but that was nothing compared to the AD&D initiative system (with the weapon speed, spell casting, weapon length, etc. all worked into).
I think we also have the fact that a lot of those who love to houserule also have tended to stick with 3.5. 4E was designed to be a lot more inherently balanced. Whether it succeeded is a long discussion, but that fact is changing a part of the system tends to have lots of ripple effects among that inherent balance, and that makes it less attractive to the house-ruler who likes to have 10 pages of houserules.
Dykstrav has hit on some other reasons.
AD&D had a lot of what most considered "unplayable" rules. I know there are groups that played with all the rules as written, but I never met them. Many parts of the game were just too bulky to be used. Most used simpler methods, adjudicated them on the fly, or had various house rulings for them.In the 1E days, house rules were often used to make the game playable, according to the tastes and preferences of a particular group.
I don't think this was tied to 2E. I certainly remember it happening before that. In fact, most gamers I know hated the restrictions on non-humans from a flavor standpoint. They were commonly houseruled.In 2E, many DMs house ruled in order to tweak the game to fit their setting. In many ways, 2E was one of the most interesting times to play D&D because many DMs spoke of their games in terms of creating an ongoing narrative or at least a shared setting. Many DMs house ruled simply because they wanted to change a basic premise of the game in their own setting ("elves can be paladins"), or because they wanted to adhere more closely to a preferred milieux ("clerics of the war god can use swords.")
I think that house ruling did change with 3E. However, much of that was because the above mentioned types of houseruling were made obsolete or greatly reduced.When 3E rolled around, there was a major shift in attitudes towards house rules. Most players and DMs were willing to accept additional options (new feats, deities, magic items, spells, et cetera), but seemed resistant to fundamental changes in the rules themselves (methods for determining initiative, hit points, weapon damage and the like).
You didn't see people houseruling things like whether a gnome could be a paladin. The assumption was that all races could be anything, and weren't limited in their advancement. Much more common houserules were that certain races couldn't be certain classes, and that was mostly in the early days.
There also weren't too many "unplayable" parts of the rules set. Some people would dislike a certain part of the 3E and make a houserule, but you didn't really see "unplayable" parts of the rules set. Some had problems with Attacks of Opportunities, but that was nothing compared to the AD&D initiative system (with the weapon speed, spell casting, weapon length, etc. all worked into).
I think we also have the fact that a lot of those who love to houserule also have tended to stick with 3.5. 4E was designed to be a lot more inherently balanced. Whether it succeeded is a long discussion, but that fact is changing a part of the system tends to have lots of ripple effects among that inherent balance, and that makes it less attractive to the house-ruler who likes to have 10 pages of houserules.