wear a gown
It’s a descriptive rule, not a prescriptive rule, and likely one snuck into the powerpoint to try and get the class thinking and laughing. Like calling the descriptions of gravity the “laws of gravity”, it describes something about the world we’ve seen, but there’s no Physics Police enforcing all matter follow the “Laws” - it’s just the term we use for a description of how things work.
A lot of advanced English classes are much more on the descriptivist side of things - observing patterns in ways we use language - than the prescriptivist approach we get in grade school where we’re just learning rote things like spellings.
There is no moral way to raise a cat.
Either they live inside and live an entire life in a few thousand square feet at best for 16-20 years, or you let them outside to hunt and they kill tons of wildlife and are exposed to becoming roadkill/coyote food etc.
My personal dodge is to adopt old cats that have already been indoctrinated into inside life and who could never be let out anyway.

This is what I would refer to the extra big bags of cereal as when living with a friend and it was his turn to do grocery shopping.
“1x bachelor chow cinnamon crunch, 1x fruity pebbles.”