Exactly. FATE Core has a basic rules set. But nowhere does it say you must have five aspects, or three or nineteen. Common sense may nineteen may be a little much, but if that's what you and your players like, rock it. I'm certainly going to give five a try, for the reasons I listed above, full in the knowledge that we can always add more if we want to.I think you're right on about the Aspects. The good thing is that you can probably treat them as a zero-sum entity. For example, I run DFRPG so my players all have 7 aspects. When I bring up the FATE Core conversion, I'll tell them they MAY reduce/combine down to 5 aspects, but if they want to keep 7, that's fine too, because they can be compelled just as easily as they can be invoked. Nothing's going to break.