Well, for what it's worth, I use dry kibble as the mainstay in my
cats' diets, and have fared very well. However, I should also
point out I've only had females, so I can't talk about urine
crystals and such like. (All three past cats lived well into
the double digits; 18-20.)
I go with what dry food my vet recommends, which I keep on
hand in a bowl all the time for the cats. In the past, I've been
able to simply fill a large bowl and keep it topped off. I currently
have a cat who is gaining weight and I want to head off any
weight problems at the pass, so I'm filling the bowl about
half-to-one-cup twice daily. Then I use organic wet food, bought
at a nearby health food store, as "goodies" to augment their diet.
I make sure they get plenty of water, and monitor output to be
sure they're eliminating normally.
Until these two new cats, I've never had a weight problem with
cats, so the system has always worked for me. And now that Treat
is getting used to the idea that the food is always there, (versus
set feeding times at the rescue where she lived until recently) and she
doesn't need to bolt it down, she's eating more normally.
Just another viewpoint. I'm willing to hear objections to it. :-)