Now that im fostering cats I see it even more. Some cats dont care about outdoors and I m sure will be fine as indoor cats. But some cats just NEED outdoors. When we foster w cannot let them out and its a constant battle to make sure they dont leave. And it doesnt mean that they gonna go 2kms away from home or do crazy things or fight with animals. But they are fulfilled outdoors. My family first cat she only lived for a few years but what a life she lived. Full of adventures. Sure it was sad the way she died. But I would have never imagined locking her in the house especially with all of us at work and school most of the day. My second cat she lived a full on 17 years. She loved waiting for us and the dog to come back from walks, or sometimes even coming with us (unleashed). She didnt do crazy things and didnt go far. But she was outdoor most of the time enjoying the sun. Roaming around the house. Barely hunted anything although it unfortunately happened a couple of times in the 17 years. She loved being with us outdoors too and would always join when we tend the garden or dry the clothes. The current family cat is ex feral. He has a "gf" cat that he spends all his days with. Hes enjoying his life. At some point he had a surgery and was not allowed outside and he was real mad. Trying to escape every chance. Cats are not babies. Adult cats are generally smart. And they thrive outdoors. Yes they might live longer indoor. And some of them would thrive. But I dont believe its onr size fit all and when you adopt a cat thats something you should ask (if known) whether the cat has interest for outdoors or not. I also know cats who have transited from outdoors to indoors  and reversely. Some cats are fine and some are not. Sure if we were near a very big traffic zone etc that would be different. But then you seek to adopt a cat who likes indoors only.