How about making the key shut off the turret instead of giving access to the loot?Okay, maybe without the indestructible blocks, but with really hard blocks and chests. Just an idea that came though my head, I only wanted to share it.
There are already pois with steel walls that protect the loot room, it just doesn't make sense to adopt this everywhere. The idea to have multiple versions of the same poi with the loot room in different places would hinder shortcutting too but be much better for the game than creating artificial walls that look like wood but act like steel