Afishinado,
You say that you fish flies that simulate what is active or hatching for that particular time of year.
My question to you is does your fly, for sake of argument let's say little black stone, really look anything like a natural insect?
My guess is not.
I consider myself a fairly realistic tier, adding gills, antennae, realistic wingcases, the correct number and position of legs, etc. But no matter how hard I try, the flies I tie are not twins of the natural, they are just closer than "standard" patterns. I'm getting that yes, my details in my flies aid me in catching more fish, but not the main reason. And, if a fish were to get fineky about feeding, it could surely tell the difference.
I honestly feel that the reason I catch plenty of fish, is because I fish areas that have fish or could have fish (which I feel that most anglers do not) and present the fly correctly the first cast (which again I think most do not).
Also, just though of this, I have been fishing the Kish a lot since August, and under every rock there is an over abundance of caddis (all shapes and sizes), scuds, and cressbugs, but have yet to see a mayfly, but yet 98% of the fish I catch in the Kish are on a variation of a pheasant tail. Why are they taking the PT and not my extremely close to natural caddis larva. And both ride near the bottom, and I attach my flies in a manner where both flies are each tied to the leader but not attached to one another in anyway, and are only a few inches apart.
If there are little active mayflies but the caddis are everywhere, why do they take the PT every time? In this instance fly selection is key and has nothing to do with active insects.
The only point this proves is that fish chose what they want and we realy don't have a say.