Fly fishers tend to give trout far too much credit in terms of intelligence...
If it looks like food at a given moment trout will eat it
Our goal (or at least mine) is to fool fish with as few casts as possible; so fishing the correct "match the hatch" dry fly in "the wet zone" is not actually presenting what they seek to eat BELOW the film.
Happy "surprises" do happen though all the time as there is often no accounting for why trout eat something.... Personally I find that trout are very "picky" in terms of "hatching matching" ON the surface but willing to be less picky below the surface.... just look at the zillions of "nymph style" patterns on the internet.
My observation is that trout seek IMATATIVE BUGS on the surface and SUGGESTIVE BUGS Below the surface; todays trendy & "modern" nymph patterns look very little like "real bugs".
IMO when you consider BEADS, HOT SPOTS, SYNTHETICS, FLASH AND UNNATURAL COLORS USED ON NYMPHS BELOW THE SURFACE; fish SHOULDN'T EAT THEM, but they they do for some unknown reason.
Someday you will be dry fly fishing in a river with your line trailing out behind you in the current (and paying no attention), your fly will likely get swept under and be "trolling" down river so to speak and while you light your cigar a big fish will whack your fly even though all fly fishing "wisdom" says it should not happen...
You will play this fish to hand while your buddies watch and think you are a magnificent fly fisher and HOPE they didn't see the fish strike while you were paying no attention!
Good luck to you and ask all the "dumb" questions you want.