The Chelsea management should not have waited long to appoint a new coach after firing Potter. Bruno Saltor, who was appointed as interim coach, is indeed a bit difficult to carry out this mission, especially when he has to face Real Madrid, who are the defending champion team who have quite a lot of experience in the Champions League. If you compare with the success of Chelsea's temporary coaches before then it was just luck and of course very difficult to repeat. If the Blues want to take the Champions League more seriously, then bringing in a new coach with experience is the right solution. Now there are rumors circulating that Chelsea management will soon appoint Nagelsmann or Enrique as permanent coach.
Indeed Chelsea have not been the same since the take over, the previous owner would have sacked Potter a long time ago, so much has changed and I think Boehly is taking too much responsibility even some which the coach is supposed to oversee, I think that could also a part of the problems in the club.