People criticise Chelsea for their hiring and firing policy but because we have this blind faith belief we won't ever do it
Chelsea are better positioned to do what they do. It's a top down strategy. They don't sign or sell players based on manager/head coach decisions alone. They sign players that the board feels the team needs, taking the manager's and scouts' opinions into account.
As a result of this strategy they can hire and fire managers who are essentially head coaches, there just to get the best out of the squad. They don't need a rebuild every time a new manager comes in. Tuchel came in and found a ready made squad and by shoring them up defensively, he won the CL.
We do not do that. We seem to follow the model Fergie left behind, of fully trusting the manager with making squad decisions. A system that only works well if you have a genius manager whom you implicitly trust. As a result of this model every time a manager left, we were left with a hugely expensive rebuilding job for the new one. Which in turn meant giving the new manager more time to complete it, thus perpetuating the vicious circle.
Our squad is much improved now. We have a good crop of young players, some great experienced ones, and we're really only missing a top DM/CM and a better RB to have a squad capable of mounting a challenge in my opinion. However the simple fact is that our coaching team (which is comprised of an inexperienced and unproven at this level head coach and some young inexperienced coaches who just done their badges recently in Carrick and McKenna), is nowhere near on par with what City, Liverpool or Chelsea have put together with Pep, Klopp and Tuchel.
My biggest worry is that we've wasted Pogba's years here and will do the same with Maguire, Bruno and Varane, without having the staff capable to coach this team to a title.