I suppose the simple answer to that would be experience...
I'm not for one second challenging anyones perspective.But it's pretty safe to assume that most of us have watched or played football for years, so have a reasonable insight into the game. Where as not many people spend a lot of time around planning meetings/submissions, or indeed the legal aspects of building buildings.
I would question the comparison for those of us that have played park football and perhaps coached some kids along the way with someone like JFH who has lived and breathed football since he was a kid. He's played to the very highest level and passed all the coaching badges, and they are a pretty tough.
It must be galling for him to hear butchers, bakers and candlestick makers that watch Match of the Day and go to games every week or so telling him he's tactically naive.