So is what you've found going to ruin the airplane.

Probably not.
Thousands of people don't even know it's a problem. And most couldn't care less even if it's explained to them so they understand it.

A bunch of them simply put it down to, "that airplane is a bit tricky to fly, but it flies great otherwise, what's the problem" or say "it's a little touchy to land and you need to keep the turns a bit open but it's just a snappy airplane"

They don't have to be. And knowing a bit more about what you've got and what you're doing often helps make your airplanes just a bit better than everybody else's. Heck, there are people who think "it's good enough" is good enough.