Fluffies are actually high-maintenance what with the saferoom and all other amenities they need, that’s the canon so I don’t know where you got the idea that you can just “let them be” and it will magically work, these things can drown just by looking at water remember?
In my HC I explain that because it was an expensive pet (as a genetically engineer animal would be IRL) being high-maintenance wasn’t an issue but then hasbio lost control of breeding the fluffies became cheap as hell thanks to mass production. So now you got a pet that you can buy from a vending machine for $5 but requires its own room, special toys and special food, that’s hundreds if not thousands of dollars.
So what happens is that people get a fluffy and when it “breaks” they get another since that’s far cheaper than having to buy all the other crap hasbio said you need. Mass production turned fluffies from a pet with 5-figures prices to a disposable burner phone you get rid off just to get another.
Except the phone isn’t alive.