As mentioned, enshittifying doesn't mean "make shitty" or "make worse". It's a specific exploitative company MO, like taking a product like Bitwarden and the goodwill it's generated with open source contributions, free plans, etc., and exploiting that trust by selling it to private equity, unbeknownst to the users, in order to squeeze the most out of it they can and then scrap it.
I agree with you that "enshittification" has a more specific meaning than just "make worse". Yet, the enshittification of Windows doesn't really follow the mold you described, even though I'd also call it enshittification.