I think it depends on the circumstances at the time, and the child in question. While you are correct there is no right and wrong, there also isn’t a single answer, even for one family. The answer today may be different 5 years from now.
This.
Right now and so far in the past - no. As in no we wouldn’t charge them rent because no, they cannot live with us. (Small house, one bathroom, many kids). They lose room privileges after Christmas break of their freshman year. Remainder of college, they can come home for breaks and we’ll happily make space though they don’t get their private room back (it’s been inherited by next oldest child). After college graduation they get a few months - if needed - to stay while arranging other living accommodations (so far, not needed - one already had an apartment with a roommate by junior year, one got her own place in another city while attending grad school, then stayed with future in-laws between graduation and wedding when she moved in with her new hubby

)
But that’s been the oldest ones. Now that there are no new babies coming up and everyone has their own bedroom, we’ll probably be more lenient with these youngest three - but still it’s our philosophy that once they are adult, they need to GO adult. We always provide food, laundry supplies, and bathroom usage to any of our children no matter what. Living space … well that may be a tent in the backyard if it comes to that
Main thought behind it all is that adults get to (have to) make their own decisions - from when to wake up, to what they eat for dinner. And with a small house, everyone here always knows (and is effected by) everything everyone else does - so it’d be hard to create a true parent /adult offspring relationship while in the same home (for us at least). Plus, eventually, we’d really like some privacy - LOL!
Note - this is all talked about, discussed, and communicated with them throughout their growing up years - both the what and the why - and no one’s felt “kicked out” at all. We work very, very hard to make sure they have the background, education and opportunity (should they choose to make use of them) to go successfully “adult”. It’s our family culture if you will.
