One big win cannot be said to be an illustration that AS Roma is experiencing good development, it is not an easy thing to be able to score 7 goals in one match but each match will provide different challenges and difficulties, and the most important thing is how AS Roma can be consistent and that this has been their problem for a long time, where they can win but also lose even to teams that are not considered capable of doing it against them.
The big win is against the philosophy of Mourinho. He does not want big wins but as many wins as possible in a season. Many years ago, Mourinho said something like if you win a match with big result like 10-0, it's nothing more than 3 points. If you win 10 matches with a minimal result like 1-0, you destroy the league.
I knew he is happy with Roma after having first three points in Serie A but he will force his players back to work and get other wins. With him, as quoted, minimal win is enough but his team have to win as many matches as possible.
It would be true if Roma won matches against big teams like Inter, Juventus, Lazio, Napoli and others, that's not just in the first half of the season, but in all matches this season. If Roma wins over a bottom team, that is normal, because based on the quality of the players and coaches, the bottom team has lost to Roma. Serie A has only been running for 4 matches, Roma still have many matches to go through to be able to prove their improvement.
First they must win against weak and average clubs in Serie A and if they can do it well, they will collect many points. They don't have to win all big clashes with those big clubs even it can be a metric to assess Roma quality in Serie A. To get good ranking in a league, you must find balance between collecting points from weak team and strong team. Facing against strong teams, avoid losing points is important.