I thought I'd put something out here that I've been thinking about for the past couple of days and can't get out of my head.
The rules in RPGs are made to promote a certain style of play that the designer or designers want to facilitate. If you're using a certain system, it's assumed that you want to play/run a certain way that this system promises. If you are house-ruling, modding, and/or kludging an RPG, why are you even playing that game in the first place? Discuss.
Also, here's some food for thought: Oberoni Fallacy (noun): The fallacy that the existence of a rule stating that, ‘the rules can be changed,’ can be used to excuse design flaws in the actual rules. Etymology, D&D message boards, a fallacy first formalized by member Oberoni.