Compared to Mancini, Southgate is a rookie in terms of international football management. Mancini has managed in England, knows how English players play.
Sure, England has appointed previously non English coaches and failed to sparkle. Its both the players & manager.
How many England first starters play in non English league? Only Trippier.
Jude & Jadon don't even get to start. Jadon don't start is good....at least he will be fresh for Man U next season.
Look at italian team - Jorginho, Emerson, veratti are playing outside their home countries.
Sure English league is lucrative but such inwardness is costing them.