Mourinho was amazing when he was working for Porto or the other teams like Inter Milan but as you already said maybe his tactics are old and that's why they're not working anymore but Mourinho is still the same and he has not changed at all while that's the main problem he has.
After he left Roma, they changed and improved a lot with De Rossi and you saw them win the game against Lazio while it was not easy at all as when De Rossi was hoping to see the game finishing faster because the result could change in a moment.
I agree with you, those defensive tactics are outdated and have ead him to several sacks just like Manchester United and Tottenham Hotspur.
With As Roma, he did a pretty good job during his first season winning them the UEFA Conference League Competition but the club did him dirty by not investing in the set if players he wanted.
How do you want a manager to cope when he doesn't have the qualities he wants?
Though that facts now seems stupid to me because these are the same names and qualities of players managed by Jose Mourinho during his time and De Rossi doing superb crazy job with them?
I think it was the right and perfect timing to part ways with Jose Mourinho then.