The only thing I'll cite the FCS for is to discount the people saying "we can't do playoffs because they'll play too many games." Like the FCS doesn't have a 37 round playoff disproving the point.
But I'd never want more than 8 in a college football playoff. And I won't necessarily argue for 8. But if it's not 4, it's 8. I don't want any part of first round bye nonsense.
If it were up to me and it went to 8, I say play the CCGs, take a week off, then start the playoff. This year, it would be 12/19 first round, then play the semis and championship game as presently scheduled.