Years ago (and I mean many, many years LOL) there only used to be wet food, plus the likes of Go Cat dry. Most people, myself included used to feed mainly something like Whiskas in a can, with Go Cat dry mixed in sometimes. It wasnt till about 11 years ago when I got my first pedigrees, that I was persuaded that dry food was the way to go, and didnt really questiion it then. After a while I started looking into cat nutrition and realised what a really ridiculous idea dry cat food is. This coincided with several of my cats having dental problems at quite young ages (some having to have extractions at 3-4 yrs of age), digestive upsets and the worse thing, urinary tract problems, leading to Ben suffering a blockage requiring emergency treatment.
So 2 yrs ago, after yet more research I changed them all (even the die hard dry food addicts!) onto wet food only, then gradually introduced high meat content foods and then finally onto a mainly raw diet. The change in their demeanour was evident straight away, they had more energy and there wasnt the awful hanging over the water bowl I used to see when they were fed dry only - they were getting all the moisture they needed from their food. Sadly it was too late for their dental problems, but Ben never suffered any more problems with cystitis etc, nor did the others who'd had that problem.
Dry food is a totally unnatural diet for a cat and I would never feed it as the only food again. I see dry biscuits as a treat food, and my cats get a handful each at bedtime every other night, on the other nights they have a couple of cubes of raw beef or chicken or whatever I've got available.