He took over a worse squad with a drinking culture, they were also different times which you can't compare like for like. Football and its culture was different in those days, it wasn't a given that you were at the peak of your fitness levels, there wasn't the technology and the statistics+know how that we have nowadays to achieve that, the pressure on players and managers are on a smaller scale thanks to social media not existing, the money in the game is bigger than ever as are the stakes so less patience, etc etc.
Nowadays, 2-3 seasons is enough time in modern football to establish a squad that at least plays in your style (which was what I responded to don't forget: (for example, like earlier Mourinho teams, possess maturity and brains to finish games off). If you don't believe that is enough time for any manager, then Mourinho is not as good as you think he is and he will not succeed anywhere in world football today as he isn't afforded enough time. Luckily his record suggests by the 2nd season his team play exactly in the way he wants them to though, so 2 seasons of time is not the issue... NORMALLY.
This one feels like it still lacks that steel and maturity.
I am strictly posing the question that naturally comes from your post that I quoted: "why is this team still lacking in areas that are uncharacteristical for a Mourinho team in his second season and when do we stop saying it's player a or b when he's had x transfer windows to replace these players?".