No, it's the other way around.
Knowing how I tend to "work" certain flies gives me ideas about how to better tie patterns. For example, the damsel nymph I tie now has a longer marabou tail for better "swimming" action.
It's made me a less wealthy fisherman but a happy one!
BTW - when I got into fly fishing I didn't think I'd be a person who'd like to tie very much. I was very wrong, and as I dabbled into tying I realized that I enjoy it and find it gives me something to do when I can't get outside.