The thing is when you move into a place, the apartment has gone through thorough maintenance and cleaning, and of-course you don't pick the apartment with the obvious water stains and mold, or the sketchy neighbors and rundown hallway. But as the time passes, fixtures fail, damage accumulates neighbors rotate.
You apartment is the best when you move in because it's made to look its best and you pick the best looking one.
When you own a place you can do the extensive maintenance yourself.