We have 4 Siamese and a pure bred moggie, all our Siamese are fed on both wet and dried food and our moggie is fed on mainly wet food and occasionally some biccies(he has a sensitive tummy) and they are perfectly healthy
Not to say their is a right/wrong it's whatever works for your cat/kitt but in our house we don't give any of our cats too much commercial food-rarely any as it tends to be far too rich for them
As we've just had a litter of 5 Siamese kitts who didn't take to commercial food at all and we are just weaning our other kitts with baby rice and chicken which is working