Heh. I've seen that said. Although I have no facts of any kind to back this up with, I think houseruling is almost completely a factor of the players and has very little to do with the system.
In other words, if a player is a house-rule-er, he'll house rule with *any* system... including all those systems that claim you don't need to!
Cheers,
-E.
I've yet to find any group that really truly runs a game exactly as written, even if it's to the extent of common misunderstandings, or "houserule by omission".
In D&D, for instance, I've yet to have a group that really paid the slightest bit of attention to spell components, especially the material ones.
The persistent presence of the latter in both my own play, and in the play of a lot of the groups I've run with, has been one of the driving considerations in my own design, in trying to analyze what rules tend to jsut be ignored, and then leaving them out.