If it says nothing to you that's fine, but for me it says a lot.
How many games did we have this season against smaller teams in league that we couldn't get the win despite creating many chances BUT we were not converting them as our players were not clinical enough. Perisic has quality, but is bad decision-maker and as the conversion rate shows, he isn't clinical either.
Our main problem this season was converting chances... doesn't matter how you look at it. The fact that Perisic has such a bad conversion rate doesn't exactly make you feel our main weakness has been addressed with him. It was being addressed with Griezzmann though but we now know that likely isn't happening.
We will get a no.9 to address our lack of goals hopefully, so this isn't all on signing Perisic. But we need more goals from elsehwhere in the team, hopefully Perisic will give us that. But Serie A is no PL, so you can argue he won't get the same volume of chances anyway.