>>3773200
people still do quad-psi, they just dont have 4 schools innervated at once
most do two at once, and they pick the spells that will help most for that fight
You still can do four at once; theres a feat that lets you ignore the penalty from one school, which helps a bit
and you can have up to 12 slots, or 13 with a special item, if you have high int and use an expanded headband
psi is strong enough that you could do this and still have an easy time, it just wont be as optimal