Christ
You're walking in a circle. It's already established, multiple times, that we wanted Perisic the previous summer. We didn't get him, yet we still improved our overall performances and finished second in the league. We signed Alexis Sanchez and Mourinho states that he's happy with his attacking options, and sees no need to add any more attacking players to the team.
Now, 1,5 year after not getting Perisic, after finishing second in the league, you're bringing up Perisic as a point as to why we are regressing from last season, even though we overall strengthened the squad and didn't lose any important players from last season.
Basically, you're only arguments is arguing over claims you are making, without getting anywhere near adressing any actual issues, not to mention not answering any questions yet demanding that others should answer your constructed claims. It's rather simple, why have we regressed completely from last season, when we've overall strengthened the squad and not lost any players. We didn't have Willian last season, didn't have Perisic either, so why are we going backwards.