Well, I used cheat engine and some cheat table I got from here, then I started a stage, downgraded the facilities from 7 to 0 then returned to the hometown.Huh. Care to share exactly how you cheated? I have basically the same problem.
Starting a stage seems to be important so the game doesn't actually notice the downgrade and doesn't try to fix it; the assets from the facilities are being unloaded from the memory while starting the stage, so when coming back to hometown the game notices the facilities are not upgraded so it doesn't load the assets.
It makes texture look better in hometown but after messing around I don't actually think it changes the combat zone that much.
Mind that you'll be losing access to the facilities and will have to cheat them back up (or re-develop them lol) and that includes the facility-related events, like the Kirara's event with MC's renovated room, Ichika's toilet event or the entire 'harem room'.
Also with no access facilities you can't find permanent items in the store like the eye mask, tattoos or other things like that so that is only so you can see the hometown with a better resolution textures.
The events that are happening in the girl's rooms and the places outside the facilities are still available though.
BTW Remember to keep textures up to epic or it will just be the worse version of them.
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