Re: afci
A master on one and two beds on the other, ditto.
When it starts to get a little weird is when you have a big master and one tiny second bedroom. I'll still install two AFI's, but I'l start picking up general lighting and outlets in the vicinity of the small bedroom.
Remember, that bedroom does not have to be dedicated. And AFCI's have come a ways since their introduction. Fluorescents and bath fans aren't as big a hurdle as they once were.