I agree.
Whilst I like getting all scientific because I am very interested in the natural world, I know I could go down the river any time of the year with a goldhead nymph/PTN and a klinkhamer and catch plenty of fish!
Maybe if you match the hatch perfectly you might maximise your catch but if the fish are hungry and something life-like passes their nose they'll usually have it.
One day last year I caught over 30 fish on the same kilnkhamer I'd had on all day and wondered why I'd spent all this cash on flies, fly tying gear etc.
It hasn't stopped me filling 8 boxes with every fly under the sun though!
I read an article the other day about mayfly nymphs saying not to bother with them outside the mayfly season but I could chuck one in anytime and have fish chasing them all day long but it's just not the done thing.
I soon discovered half the "fun" of this sport is making it difficult for yourself.
It always makes me laugh when I hear of waters banning a certain fly as it's too good

What kind of crazy sport is this?
We spend a lifetime deliberating over which fly to use and when but then when a really good one is found it gets banned

Imagine if footballers were banned because they scored too many goals or a Formula 1 team was banned for having a winning car
Would be a lot easier to put a float and a big juicy worm on...