Caporegime
Having worked in an office with a bunch of school leaver apprentices earning £20k and living with their parents I can confirm that they are useless with money and happy to live at home and live it up with all that cash and no expenses. The one guy we had who was saving like mad so he could move out was mocked because he wasn't out all the time.The thing with this though is I think it works both ways if more millennials moved out and gained some independence and knew the struggle of supporting yourself would it not push them to earn more money?
Telling people you still live with parents in your late 20's and early 30's will already have an effect on your mental wellbeing, whilst people may not be bothered or might not even know it can have a huge effect on your confidence and self-worth.
I think it's far too easy to just stay at home and say "I can't afford to move out", but I think many people (outside of London and certain southern areas) who say that actually could if they made a little sacrifice to their spending habits, gained some independence and then pushed on to make living independently more comfortable. I don't think that drive is there when you can have it easy and live at home and coast through life till you have savings for a deposit, especially when many aren't even saving properly and clubbing every weekend or buying new shiny things to keep up with whoever etc etc.