Inter did a great job at selling both Icardi and Lukaku, both of whom were just aimless after leaving. On the face of it, the sale of Lautaro should be pretty great financially for Inter with a lot of plusvalenza.
Lukaku for Icardi was a masterpiece imo (I know many disagree) and not properly replacing Lukaku was mainly due to finances/Suning being still here. Replacing Laturo's goal scoring record is not as hard to replace as Lukaku's, so on that front this sale could also be beneficial.
My main fear is that he'll explode somewhere else, but I guess a lot of money could ease the pain.