Allays shouldn't drop items to you when your inventory is full.

When your inventory is full, they'll hold the items until you have space.

This one simple change instantly solves a big part of the inventory problem. While building, it really sucks to have to constantly place down shulkers and pick them back up whenever youre low on supplies, right? If this was implemented, you could just have an army of allays carrying your building materials and replenishing them whenever you're low. Wouldn't that be amazing?