Yeah but it takes alot longer to rough a house in with pipe than with romex AND plastic is alot cheaper too. I don't think I have ever seen a house roughed in with emt. Why would you (unless it is some local ordinance or something like someone said).
It's not as if you can (legally, by code) pull more than 3 current carrying conductors in a pipe; so what benefit is there to piping it in? None that I can see (unless it's required for some strange reason in your area). If I have more than 3 current carrying conductors in that pipe, my 12's become 14's and my 14's become 16's after you derate. You'd have to pull #10's (THHN). It's a waste of time and material --- MONEY!
Unless, like I said, you have no choice.
