If someone is not a good strategist, he should be a good learner or a good listener. Ole at first is always not willing to try new things, and when he does, he'll do it in odd ways. I think why he is still eased is that there is no sign of threat from the management. Manchester United currently has bunches of good players but poor management.
I don't think Sancho who is an England national team player needs such a long time as 1yr to blend to an Epl team. With the way Manchester United is now, it looks asive no player has blended with the pattern of play. It's not player problems, it is a coaching problem. This crop of players can restore Manchester United glory only if the coach will agree.
Yeah Ole is not that good manager but you have also have to see that some of the players are also not playing good. That's why I wouldn't put all the blame on Ole. Players also need to step up inside the game and stop making mistakes but they keep on doing same and same. No matter what manager they brings in they will suffer unless they stop making mistakes. Watch some of their matches, you will find how much mistakes they made. Check the Villa game, by the end of the highlights video, I am sure you will be saying that yeah Villa could have scored more.
Sancho also haven't made much international appearances and Southgate puts others before him. Sancho needs some time to adapt the style and tbh there is lot of pressure on him.