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I don't think it was luck, this draw was the result of De Rossi's ingenuity in making substitutions so he could score a goal to make it a draw. This draw is of course very good for As Roma, currently they are only three points behind Bologna. Of course, the potential for As Roma to overtake Bologna could happen in the next few weeks. Since being coached by De Rossi who replaced Mourinho, As Roma has performed better, it could be that next season As Roma will be even stronger.
Under De Rossi's tutelage, goalkeeper Mile Svilar continues to be a starter so his performance is getting better. When Mourinho became coach of As Roma he trusted Rui Patricio more to play, for me it is time for Rui Patricio to move next season and be replaced by someone younger. The reason is, Roma since being coached by De Rossi has continued to develop from 12 matches, only losing once to Inter, and that is natural because Inter this season is too strong in Serie A.
No, a draw is not good for Roma because it has made Bologna 2 points ahead of them in 4th place in the standings. Roma ultimately failed to maintain their winning consistency where previously they had held 3 consecutive wins against Frosinone, Torino and Monza, but they had to end the match with a draw against Fiorentina.
Roma will play the second leg of the Europa League against Brighton, but thanks to their large aggregate advantage it is not a problem for Roma to play safe. A draw in that match was fine for Roma, but a win would improve the team's morale ahead of the match against Sassuolo.