I don't see it that way, Thomas Tuchel never met Chelsea at its best state before accepting to stay, Lampard was already leading Chelsea to relegation but Tuchel came with a different energy and the club rose to a different height which later resulted in Chelsea winning the UEFA Champion League and later the club world cup. Manchester United has experienced a rejuvenation in the era of Ten Hag, even if it is in the Midseason or season-ending they can still catch up with whatever trophy they want.
Tuchel was sent for political reasons, not political in the sense of elections or politicians but team politics basically. He was better than any manager they could get, and we are seeing right now how terrible they are without him as well. They are nowhere near the level they should be and considering how much money they have spent they are nowhere near where they could have been if Tuchel stayed as well.
It's just a sad situation where we are seeing them play much worse than they possibly could, and all of that is because they fired Tuchel, the guy who got them a UCL title. In the end though we are just going to have to accept the situation at hand and realize Chelsea sucks.