This is definitely a period of transition, which is why I like living on my own terms and paying my own way. Therefore, my circumstances would have to be extreme to move back with my parents. I would miss the independence.
On the one hand I like that it teaches kids how to budget and to structure domestic duties. So, of course they should help around the house, and not clear the fridge like locusts.
But does living under a parent's roof, mean having to comply to their rules. Other than respecting each other's space and privacy, does this mean abandoning curfews that were in place as a teenager, and bringing friends over whenever (which you can living by yourself or in a share situation)?
They would have to be up for discussion otherwise I could see WW3 happening pretty quickly.