Are you even supposed to shave cats or is it just a thing that some owners simply want to do and use "hot summer" as an excuse? Cause I understand you have to groom some cats by brushing their coats so it doesn't get matted and knotty. I'm just not sure it works like say people who live in Florida and have dogs meant for snowy climates. Cats just don't give a shit about that?
edit:
https://northdallasvet.com/cut-pets-fur-not/Heat Regulation
Your average pet’s fur is designed to handle both hot and cold weather. When it’s hot out and the sun is beating down on everything around you including your pet, that fur acts almost like tree branches providing shade for a patio. The fur blocks the sunlight and heat from reaching the animal’s skin, thus reducing the temperature that the animal actually feels. If you shave off that fur, you expose the animal’s skin to a lot more heat, and that can make the day very uncomfortable for a pet.
Pets are also very good at judging their own tolerance. Your cat, for example, knows when it’s time to seek out shade. If you ever see a cat panting, though, get the cat out of the heat and call a vet.
Sunburn
Shaving for heat-related reasons should never remove all of the animal’s fur. A thin layer (an inch is a good limit) must be left behind to help protect the animal from sunburn. Even with that layer, though, keep an eye on the animal to avoid accidental overexposure.
Uhhh... Seems dumb then to cut the hair on your long coat feline friend. And it doesn't look like an inch of fur was left.