Most probably what will happen is that the pimps are going to add in a "Key only" door and people just gonna dig around it.well yeah but there could be 7k metal doors ... or visually less fitting 21k instead wooden ones with key in chest especially in high tier poi like waterworks where you have concrete walls and cant easily bypass those doors on day 1 .. they have some plans on keys etc so lets wait and hope .. its significant flaw of game ....but we will need nerves of steel for future forum
Lets be honest, the whole "fastest way into a POI" situation only affects those who are already at their 5th (or more) replay so they know exactly where the loot is.
This is the reason why i suggested POI designs where the exterior is looking like the usual setup but the interior is changed up so the player must enter the area to figure out where the loot is.
Like for example lets take that waterworks where the exit is always near that tree:
Version A : Tree exit, the regular map.
Version B : Nothing under the tree, the exit is under a nearby poi. The actual inside is refurbished to look like a military base and not waterworks.
Version C : The tree is actually a second entrance leading to the same corridor setup, long routes into a collapsed cave system where the loot is in the middle between the two exits.
Variation is miles better than creating artifical difficulty like key opened doors and chests.
It was usually day 2 for us but we never used steel tools, that was endgame for us.day 3 is quite late in A18 i never used stone shovel until A19 and had atleast one steel tool and gun on day 1