Chelsea should have never sacked Tuchel. He was a top level operator going through a bad patch. Replacing him with Potter was a massive risk, but it will be interesting to see if they double down or hit the trigger again.
It's unfortunate for Potter, but it looks like the job is too big for him. At a top club, you don't get time to stick to your principles and right the ship gradually. Ten Hag went defensive and sacrificed his game in order to get some results on the board. Potter at Brighton was very much a slow, incremental shift that finally came together.
At Chelsea, there's massive turnover in players and huge pressure to win trophies despite that. Those that have gone before him have managed to deliver under similar circumstances. Potter is a good coach, but maybe he needed a move to a slightly lesser club before this one, like maybe Spurs where there's a desire but not a requirement to win silverware.