If devs brought polestagger back (mostly for support weapons), I'd like for it to stop opponents, but give less stun than other attacks. That way, no one weapon would gain a large initiative off a single hit and it would be harder to stunlock. Any sort of stagger like that is easily made unfun, but ghosting after getting hit isn't so fun to deal with either.
Old polestagger allowed multiple hits with a single weapon + good footwork and caused unwinnable situations from 1 light touch. I remember having a war spear/fauchard sidearm and would switch to it for ganks since 1 touch allowed a free hit back into my hit.