Yes, this is a very interesting question because by firing Mourinho the management showed that they have ambitions and a desire to have better results than Mourinho gave. But DeRossi at the moment only repeated the 6th place that the club had under Mourinho and was unable to repeat the Europa League final. If Roma wants something more, then they must back it up not only by shuffling head coaches but also by buying players.
They was six place on the Seria Scudetto Competition with Jose Mourinho? I don't think so, they was eight place and asides that, they saw themselves playing better good and beautiful football with Daniel De Rossi. Jose Mourinho wanted upgrade for his squad but the management failed to back him up.
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You don't need to think here, just look at the facts: Mourinho achieved 6th place twice in the two full seasons he coached Roma. Against the backdrop of the fact that he additionally won the Conference League and led Roma to the Europa League final, this is a success that will be difficult for all subsequent coaches to repeat.
As for this season, no one knows where Roma would end up with Mourinho. I think you know that every coach has his own views and plans the peak of the team’s shape, focusing on different events in the season, it is quite possible that Mourinho was leading the team to win the Europa League.