IMO I don't believe it is fair to ask any non-feral cat to be outside 100% of the time.
I mostly agree with that, but I think there are some exceptions. For example my porch cat Salty after trying to make her an indoor cat we finally decided for her she would be best and happiest outside. Now most of our porch cats have been rehomed because they are friendly and they really want to be indoor cats. But because Salty had lived on our porch for the past 12 years before we moved in we didn't think it was right to take her from her home. When we tried to bring her indoors she would jump to the top of the fridge and pee on herself and would just stay there until we moved her someplace else. However she is safe on the porch, she isn't running on the streets or in a place where dogs can get to her. The porch is screened in and we only open the screen door when we are there so she can go to the flower bed near the porch and go to the bathroom. But if she weren't in a place that was secure and well protected then I don't know that I would have left her outside.