A dungeon city can't be developed, the dungeon have a set rule to absorb anything that doesn't move for a certain period of time, equipment and lving beings are usually moving so they always reste the counter, adevnturers can set tents but leaving them for around half a day or so would make them absorbed, same if they leave some equipment on the ground and return too late.
This rule is aboslute and there is no way to go around it.
The humans come up with a method to make a semi station to help with long term explortion and stays...pseudo-campers.
MC didn't want monsters to spawn, but they do that automatically, is another rule, if i got it right he can set the type and spawn points, but if he doesn't do it they will appear automatically and I'm not sure if he can edit the monster respawns and types after they appeared, he can control them but it costs a lot of points and is complicated.
Dungeon cores are not humans, they dont' know humans and don't understand them, this chapter shows how they don't have a need for hunger, sleep or sex, they simply want to get bigger, the never starve dungeon was made from main core observing humans, absorbing their food reserves and then setting the food to spawn, that means she never checked the food taste or it was even edible (expired or rotting), she never even thought of tryign the food and even if she had done so it takes multiple attempt sto finally awaken a dormant sense for a core.
Dungeon cores can't communicate with humans, speech is simply impossible, to MC too, they deepen their understanding from checking the logs of everything that happens in them.
The cores not being able to get humans is why they do trial and errors and miss several times.
The gem dungeon summoned a human too, a jewel expert, that is why it knows what to do on that field.
Other dungoens heard of MC onsen dungeon and tried to make something similar, but simply had dungeons with fllors that had water pools, because they don't don't have any knowledge of human ills and the restoring ability of water, that the miasma can boost but it can't boost zero.