In all that time I've never had a problem with kidneys. Even better, they all have glossy coats and too much energy. My Vet complains that the only time he sees my animals is for a check up. The only time they get canned food is for a treat, maybe once a month. The rest of the time it's dry or nothing.
Cats maybe finicky, but they are practical.
Punishing you for not coughing up with the goodies might be what they want to do, but never at the cost of their own comfort. When they get hungry they'll eat. They may not let you see them eat it, but they will. If you doubt me try this experiment. Then put half a cup of good quality dry cat food out and go away.