Also MH/OH v Staff restrictions are the bane of casters existence.
I’m rocking a 278 staff on my Druid, so I can’t trade off-hands cause I don’t have a 278 offhand, even though I don’t need one cause I’ve already got a 278 staff with good itemization. But I can easily trade Agi Staffs/Polearms even if I didn’t play Bear because why would I need an agi staff when I’ve already got an int one? /s
The PL trading rules serve no purpose except to slow down gearing by wasting loot.