Prime SAF's Manchester United operated on these values
a- spend decent money only on young players. These players have something to prove, their are more moldable to the manager's system and their stamina/athletic is usually higher then older players
b- successful football clubs have balance. Ronaldo was magnificent going forward but he didn't backtrack. Thus SAF had to compensate to that with Park, Rooney and Teveth. When Scholes and Carrick were growing old, he left Pogba on the bench and he played Cleverley instead because the latter could provide the leg work.
c- avoid buying players from other top clubs. There's a very valid reason why they are getting rid of them. There's also the issue that since they have nothing to prove , they barely have any reason to go the extra mile either.
d- squads go through cycles (that's also Sacchi's mentality) and its very rare for a player to play 11 years into a club and he still remains motivated. Hence why so many players left under SAF's regime, often in their prime
e- Whatever happens you can't lose control over the dressing room. SAF loved his players as his kids but would push them out of the door the moment he felt that his authority is threatened.
f- keep the wage structure under control. If a player whose 200k a week is playing worse then 7 players on 80k a week then its only a matter of time before either the latter comes knocking at the door for a pay rise or they stoop to the level of the former.
g- United need to be at the forefront of everything in terms of fitness, training and technology.
h - protect kids. Whatever happens they can't start believing their own hype
This squad breaks every single rule
a- we spent money on the likes of Casemiro, Onana, De Ligt, Mazraoui and co
b- we kept the likes of Rashy for too long.
c- our squad is ridiculously unbalanced. We lack athleticism, work rate and we expect the two smurfs in defence (Malacia and Martinez) to win headers against 6ft3 players
d- we also lost control over the wage structure which makes it near impossible to get rid of players.
e- our squad look sluggish, lazy and lethargic with players losing form months after we signed them
f- the likes of Rashy, Garnacho and even Mainoo are starting to believe their own hype