"We have had it pointed out to us that engineers have a tendency to design aircraft for engineers, but it isn't engineers who fly aircraft!"
Which is why most aircraft design teams include representatives from the Flight Test group - both pilots & system engineers - who operate, test & maintain the current designs. In our organization, they're part of all design & test reviews including "Safety of Flight". Current aircraft are often just too complex with layers of "gotchas" - you can fix one problem only to reveal another one (or two or three) that was masked by the first.