We currently have three indoor only cats (who have zero desire to go outside
) and three outdoor cats who are all brothers that started off indoors. They were never happy being inside only cats. It was a fight every time the front door was opened, so eventually we let them just stay outside. One is a roamer, one is the hunter, the other just lounges about in the sun all day.
They are happy though. We live way off the road smack dab in the middle of the woods, so there’s a lot for them to do.
I think it honestly depends on the cat. The ones we have indoors now almost seem to know how spoiled they are.
They get a can of food a day, have toys everywhere, play houses, dh built a kitty condo that goes halfway up our living room wall, etc. We are serious cat lovers here.