While it is better for pet food fed cats to have a mixture of wet and dried food, unless your cat has a urinary problem, dried food alone IS an acceptable diet. (it may or may not be the best diet, but it is acceptable) While some cats have an issue with it, most will do quite well.
Unless you are feeding a balance of raw rodents and birds which have eaten the balanced diet for their species in the wild, you are not feeding a natural diet. It is also natural for most species to die way before the age they can live in captivity. Natural isnt always good.
The OP doesnt want to feed a raw diet if they dont have to. They dont have to.
I'm open minded about raw food really, if you want to do it and have researched it properly then knock yourself out. But it is not easy or desirable for many people and for those people they really are not going to do any real harm feeding commercial cat food. Their cat will have the same life expectancy as any other.
Am sure all are only out to be helpful really. Just dont think we know enough (as regards scientific, published studies) to say raw is as good as people would like to believe it is. I have researched other small carnivore diets and proper hard evidence is not out there for all to see. So raw food lovers - fine, but if people want to feed cat food then fine. I may be wrong of course and just not have found the evidence, but still think your cat will be fine eating cat food OP.
I suspect the breeder wants you to feed raw food and has told you he is fussy so that you do it :)