Cats can't be bothered to evolve opposable thumbs. They have human staff to take care of anything that requires an opposable thumb, why would they bother doing it themselves?
Cats are crafty enough to both survive and plan for a post-human landscape, such as climate change, World War III, or supply chain issues driving up cat food prices.
I have 3 cats with “thumbs”. Believe me they’re working on evolving them.