I feel you have still missed my point. It's not whether or not I can play my spellbooks competitively (I have and won), but that some very good spellbooks can't be played competitively because of time.
I agree that means that some books are better in OP, than others. You only have books designed for competition? That's great, but around here 95% of your matches won't be in a competition or with a time limit, so you'd be artificially restricting yourself to play those books in games with no time limit.
Put another way, I have around 25-30 non-Playtest books built most of the time, but only about 4 I'd take to a tournament. Those aren't the 4 books with the highest win percentage in non-timed games though, in fact there's only 1 possible intersect I think.