No idea how so many people still cannot see the difference between the likes of Moyes and Ole. Maybe because they are so United-centric. But the thing is, the owners of other clubs are not, and they will be looking at Ole's and Moyes' whole career and see that one of them at least has a long history of consistent outperformance relative to resources, so you can hope that he can recreate it. Ole has none of it. Any owner doing even cursory Due Diligence on Ole would find:
1. Molde. Ole had more resources than all other clubs in the League due to a billionaire owner. Won a few league titles initially and also had a decent EL run, but then regressed and could not win the title again despite the club being financially dominant. Had bad defensive record. Both times after he left, the club's performances improved, and they won titles, suggesting that it was him who was holding the team back. Fans were quite happy to let him go and astonished that United hired him full-time.
2. Cardiff. Took over when they were 17th, finished 20th. Spent 40m on 20 players, most of whom flopped. Promised attacking football - not delivered. No style, questionable selection and tactics. Was 17th in Championship next year despite the spending. After he was sacked, they improved and finished 11th.
3. United. Improved atmosphere after Jose, but very inconsistent, overall based on metrics only marginal improvement (on expected points we were 4th in both his full seasons and in general not much different from Jose and LvG) at best whilst spending a lot. Totally crashed in the third season after getting Varane, Sancho and Ronaldo. No style, questionable selection and tactics. Reliance on subpar coaching staff. Empty promises of game-time to squad players, favoritism, rushing players back after injuries. On the positive side - well-liked, initial good record against big teams, decent recruitment although for lots of money and no hidden gems uncovered. Limited youth promotion.
Overall, the picture is of a weak manager who has some good qualities, but they are by far outweighed by bad ones. Very little bang for the buck.