I'm not a fan of proration myself. It takes away a lot of freedom in combos, because there are clear set "best" combos for any situation and being flashy is pointless because you don't generally get worthwhile damage. The BBBR system seems silly, sure, but I like that it lets you do whatever you want and it doesn't punish you for it. I think that's the logic behind the mechanics of the game, like the damage scaling and the lack of hitstun deterioration, it's about giving the player freedom and having that freedom be worthwhile.