House rules that were not REDESIGNING the system to provide AD&D nitty n gritty, without armor, or without magic, or whatever?
Weren't the other D&D like options from Pre 3e/OGL things like Paladium, Rolemaster, MERP, Ars Magica, and GURPS?
now, keep in mind that i see absolutely nothing wrong with that, and it's all good... it's good to have unified system to introduce people into the game and everything.
but i don't have lots of money to spend on "alternative d20" books. and, most importantly, i have zero time to read them... or to redesign the system by myself.
www.d20srd.org check out the variant rules section for OGC things from Unearthed Arcana such as vitality points instead of hp, level based defense bonus to AC for low armor campains, different skill systems, magical taint, sanity, etc. Free and Legal.
Of course if you don't have time to read such rule variants to fit different campaign styles then most of the options from 2e wouldn't be available either (historical setting books, ravenloft CS for fear and horror mechanics, combat and tactics for some 3e similar tactical combat, etc.)
which leaves making up house rules in 3e vs making up house rules in 2e.
A matter of opinion, but I don't think it is tougher to tweak 3e than 2e to most variant baseline desires.