the Jester
Legend
Here's a tip for DMs who love to houserule everything: Your players are probably not impressed.
I think you're addressing a specific type of houseruling here, where the DM nerfs a character option, yes?
There are lots of other house rules possible, and some are even requested by the group (for instance, I use a "colorful critical hit" system that was created long ago in response to player demand).
I don't mind houserules but if the DM is overriding a rules legal option, it should be because its not fun for the group, not because the DM takes a personal exception to it.
I think there are plenty of valid reasons to adjust things. Sometimes something doesn't fit a given setting. There's no reason that a DM should have to shoehorn something into a game where it doesn't fit; for instance, there's no reason that a Forgotten Realms DM should have to let a player use a warforged. And historically, D&D has been full of options that really, really needed mechanical fixing, whether because they were overpowered (the 1e cavalier) or because they were too weak (the 3.0 bard).