i don't know why this is a suprise. vlahovic is not a prestigious enough signing for a club of psg status. imagine replacing departing ibra, cavani, messi, mbappe and soon neymar with vlahovic and chiesa.
it' like juve replacing ronaldo with kean and milik. absolute embarrassment.
Actually if Juventus is dead set in keeping Allegri, it's likely Vlahovic will continue to struggle. That relationship is broken, and Vlahovic seems to be mentally "weak". If he's not gone now, in 6 months we'll probably be more than warmed up to the idea of selling him.
if the alternative is Lukaku, then i would probably prefer to gamble on him staying - Lukaku is also not so fit lately and had few injuries (miessed 18 games last season). But for Vlahovic its crucial season if he keeps on like in the last one, then the offers in the next summer will be 20-30m, not 70m.