Comment by TalEs

Much better for the surrounding native animals though. You of course need to provide them with enough stimulation, play with them and keep them active. Their concept of sanity is not like human sanity, cats like to be in enclosed spaces that have their scent and they feel safe in the environment. It's partially how they were raised and genetics, if they would prefer staying indoors or trying to stay outdoors. Keeping them indoors since young makes them accustomed to it, and is the best age to train them with good habits.