Cat doors are a good thing. Mine go outside to potty.
Sleet was falling and the ground was frozen. The cat came in, used the cat pan, and then went back out.
No cat doors here, however. That’s how you get possums or bobcats (or bobcats chasing possums) in the house.
All my cats went outdoors do to their business. Never had a cat box. Never lived in a city or apartment.
That might work here...
...at least until the coyotes show up!