Regular wet foods also contain cereals & vegetable protein to bulk them out, so I think it is a case of swings & roundabouts. I like mine to have some good quality dry food in their diet as they usually contain trace minerals etc, not usually found in wet food. Whiskas supermeat & Classic cat food don't have cereals in but whiskas/felix in jelly or gravy do - AFAIK, the gravy versions usually contain the most. I have recently switched Alice to a wheat-free diet, so bought Bozita wet food from Zooplus (93% meat) to go with her dry. I have been trying totally grain-free food but she isn't impressed with it. I have compromised by giving her Purina one sensitive which doesn't contain wheat, but does have corn in. Her poos have firmed up and there is no blood, but still smelly (waiting for results of tests)
There are some very high meat content dry foods around - ie Orijen and Applaws (also sold as Encore in Sainsbury's)
ETA - Trigger sent Alice some "taste of the wild" grain-free food and she was happily eating it this morning