About allowing switching sects mid fight. Here is my take on this from another topic :

I'm reluctant about switching stances midfight. It might make the class overcomplicated, and not in a good way. Think about it, the same spell , cast for regen, switch stance, cast again for shield. It feels unnecessarily clunky.

-For lighspeed, my opinion is still reduce/remove cooldowns.
-Cards: they should allow holding more than 1 card at the same time. This is to offset the rng nature of the system. Increase card's duration to 25s.