That would require every player even new ones to make very complex loot filters and understand what loot is valuable and not to automate it.
Every item in PoE that is automatically picked up doesn't take up inventory space (Metamorph organs, Expedition fragments, Sulphite, Azurite). The concept is that players make an active decision of what they're picking up and that they're aware of what they have because they made an active decision to pick it up.
It doesn't take control of their inventory away from the players.
It also feeds into the dopamine loop, when you get an exciting drop you see it on the ground it doesn't automatically just get sucked into your inventory.