Completely agree re the DOF, have said this numerous times, and I think this is one area Levy got horribly wrong when he acquiesced to Poch’s ambition to be an SAF and made him “manager” not just head coach.
I am a massive believer in the DOF system, always have been.
As far as the cyclical nature of Mourinho’s tenures, I am coming to the opinion that this is pretty much football. Intense methodology required for success seems to have a shelf life of 3-5 years. I’m sure there’s the odd exception, and ways to extend that with clever management of resources, but rare.
Poch had the opportunity to refresh his team with the young minds and legs of the academy - he spurned that opportunity and instead repeatedly tried to get tired old square pegs doing round hole things. Stupid.