I agree!My cats have an escape-proof garden they go in as and when they choose, which sometimes includes when it's wet! It gives them a whole dfferent set of experiences that no indoor cat could be provided with. It also more than doubles their living space. So far as I am concerned, it's the perfect way for them to live.
My garden is not 100% escape proof but my cats seem to be content and have no interest in "escaping". Besides, after what happened to my Smokey I am now more determined never to force a cat to be indoors.