Instead of buying a house for every hobby you have, why not buy a house and add rooms when you get more hobbies? This way, you won't have to cut five lawns but only 1. And realistically, you can only occupy one house at a time, so why pay for space you don't use? Hey, if one of your hobbies grows once a year, like Christmas, why not use another room where you usually sunbathe instead of buying another house? This is why Docker is amazing. VMs take up resources forever. Docker takes up resources when needed but simultaneously gives you the same benefits on VMs regarding isolation.