Some buildings and houses

Why is it that some Houses and Buildings you can’t go in, non-boarded up ones.

Simply because certain level of FPS has to maintained, a.k.a polygon budget. So every house, shed or building cannot be made so you get into them.
These buildings are just creating feeling of town, city, etc.
And this affects all platforms, PS4, XBox, Pc. Game makers have to keep in mind some limitations these platforms have. And make the game enjoyable most of the current systems.

makes total sense, sometimes when I am being chased I’ll run to a house then when I can’t get in…oh crap