In the goal scored by Abraham, with support from VAR, the referee should let the moment to be finished, then if necessary, he can use VAR to check that situation. If the referee had not whistled in that moment, Roma would have had a goal to equalize. Vertout made a bad penalty shot obviously.
-snip-
It's not new Italian referees make mistakes in making decisions. If we are remember, this happens in every season.
However, I agree with you, Roma's defeat this time was not because they played badly, I saw mourinho had managed to build a solid team slowly. Mourinho is also realistic about not targeting a champion this season because he knows that his current team still needs more training to build strength in order to compete for title. maybe next season (if mou still in roma), we will see Roma more better.