I agree that signature does not automatically mean great restaurant. It just means guaranteed to be expensive. It also means less people from the DDP unless they are on the deluxe plan or willing to burn 2 credits on the regular plan.
Not sure why having a kitchen would mean no need for a restaurant. I have a kitchen at home but still like to eat out from time to time. Plus the studios don’t have kitchen only the villas. I can’t speak for everyone, but if I have a villa with full kitchen I don’t cook dinners there at all. I mostly use the kitchen for breakfast an occasional lunch and snacks. Having a villa with a kitchen wouldn’t prevent me from eating at a restaurant in the resort.
Why would having guests from CBR eating at the rooftop restaurant be an issue? Many consider GF to be the true flagship resort at WDW and it’s a short (and free) monorail ride from MK and it’s 20M plus annual guests some of who are so “poor” they don’t even stay on property at a value resort let alone a moderate