Absolutely fantastic player and truly in the world's top 3 players in that specific position and skillset. Gives us a lot especially against parked buses.
Having said all that, give me an offer for 80 million and I'm taking it. Sometimes you have to be proactive - I get this terrible feeling that we will never truly be able to rely on him injury wise. Given the nature of his injuries (varied, and consistent) and him never really ever having a proper season even at Leipzig - I just find it impossible to rely on him.
The argument of having him for whatever games he's available doesn't quite make sense because you don't have players of this quality in your squad in a vacuum. Him being here means he's the coache's plan A and we don't sign a replacement for him, wages, etc. So I'd rather cash in when his value is high.
Hot take that as I love this guy as a player, but sometimes you have to make decisions and not be reactive, although Barca has never shown to be such a club so I doubt that happens. If anything we only ever get stuck with players for too long than sell early.