Let us just accept that his departure was a loss, and he is clearly a class player.
Though Pep rightly has a strong reputation as a developer of young players, ultimately the club suffered because of a perception built up over the past decade that we are poor at giving youth players a chance - partly based on reality, partly due to playing in a league which is so competitive and physical and also media bias in inflating anything that could be construed as negative for City.
Hopefully with Foden, Zinchenko and ideally 2-3 more over the next years, that perception will change and we won't lose the next Sancho.