Maneki Nekogenome This whole "knows about Championship football" thing is nonsense
Stam had absolutely no experience of Championship football and got us to a playoff final, because he played the right system to win matches and caught a lot of teams by surprise that season. It just so happens that he didn't adapt properly in his second season.
It doesn't matter where a manager's from, if they come in with the right ideas then they are perfectly valid appointments. There's no special Championship tactic that only experienced managers know
I don't think there is a special magical manergerial/tactical formula, but I do think foreign managers CAN be taken totally unawares by the physical challenge of the championship in terms of the sheer slog of the 46 games, and the utter lack of time you get on the ball. I also think that many of the tactics they TEND to employ aren't suited to coping with those challenges.
that doesn't matter that some one couldn't come in, assess those challenges and come up with a team and tactics to cope with it though, obvs, but youd imagine its more likely with someone who has been there and done it before
But the opposite can also be true, sometimes a merry-go-round Championship manager will achieve nothing and try tired ideas, when a fresh perspective can sometimes work (see Stam)
My point really is that it's silly and a bit Brexity to say "no foreign managers"