Well no, it doesn't do any harm, but have you never been "just flying" with no plan in mind and decided that you might as well just pop in somewhere for a cuppa, a sarnie or pee? It is a very liberating feeling.
I guess it is because I do a lot of flying in the USA where you can land anywhere. If you phoned for PPR in the USA the guy would probably say "are you stupid or something, of course you can land here, it is an airport"....
