Cat owner here too. One of my cats is a pure-breed Maine Coon, the other is a domestic mid/long hair. They have never ever been outdoors cats (well, the latter was a stray so I guess she was?) but they’re indoors kitties now. No issues at all, they have no interest to go outside. They are happy and content. I support indoors-only cats, and this is from someone who lives in a shoebox apartment.