Things are perfect with 3 9 powered cards. Just look
There's Only 1 LD with 9 power. (Good)
There's only 1 clan Leader with 9 power (good)
There's only 1 CR with 9 power (good)
So u see it makes them special and its fine with the max being 8 so
UR DONT RELEASE ANYMORE 9 POWERED CARDS!!!
On the other hand moving higher on the power ladder has benefits too. Right now the majority of cards have base powers between 6 - 8. An 8 powered card overpowers the 6 powered one with a 4:3 ratio.
If we were playing with 8 - 10 powered cards, that ratio would be a tamer 5:4. Beating a card would therefore be more influenced by how well you pilled, and less by how strong your card is. Also climbing over attack manipulation bonuses would be easier too.
I'm not the biggest fan of it myself it but it is good for innovation. UR can't just repeat the same formula of 8 powered cards forever; there is only so much you can do with base stats up to 8/8. And besides, the 9 powered cards we do have now aren't exactly over-powered. Van Weasel is very strong though.