Have had 2 cats in life: 1 would always want to go outside (my record of going toward the front door, then U-turning toward the back door and them following me throughout was 17 return trips until I got tired out and let them out). -10C outside? Still wanted to sit on the patio for 10 minutes.

Cat2: completely afraid of anything and everything outdoors. Will follow you around the house, but absolutely not follow you outside.

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.