Larian Studios Forums Divinity: Original Sin 2 Divinity - Original Sin 2 - General Inventory Management Needs a Revamp

Blacksmithing at least is shared in the EE - you can have other party members repair your stuff while you're wearing it.

I wouldn't get your high hopes up for big inventory management changes in D:OS 2 - not if they want to keep the "drop-in, drop-out" co-op style going, and especially not with competitive questing.