At least we're looking at a progressive, forward-thinking manager on the up where Ten Hag is concerned. Two Dutch league titles in 3 years (almost certain to win this year too), consistent CL runs every year, plays pleasing on the eye football whilst maintaining an excellent defensive record. All on a shoe-string budget and after losing key players yearly. He's earned his chance to manage a big club.
Also, take a look at the credentials of his predecessors. This is merely my opinion and not a professional assessment, but here goes:
Moyes - Biggest mistake in the clubs' history. Laughably out of his depth.
LVG - One of the greats in his day. Unfortunately, that day had long gone. Outdated.
Jose - Should have succeeded SAF. Three successive failures at his previous jobs were a warning sign. Outdated.
Ole - performed better than many gave him credit for, but ultimately out of his depth like Moyes.
So maybe the job is not a poisoned chalice after all. Maybe the club just got it wrong four times in succession. Ten Hag is unproven too, but he has shown that he can piss with the big boys in Europe, unlike Ole and Moyes before him. I've got a good feeling about him.