I also think the same as you, Conte's decision to sell Osimhen, is very unfortunate, whereas if you think about it, if Conte had paired Osimhen with Lukaku, Napoli would most likely have great ammunition for the front sector, even becoming a big threat to Serie A clubs and Napoli will be a club to watch out for in Serie A this season, but the decision that Conte has taken is a unanimous decision and it cannot be denied that he knows better about Napoli's future development.
It should be like that, pairing Osimhen with Lukaku will certainly make Napoli's front line even more frightening for opponents. However, the problem is that Osimhen has long wanted to leave Napoli, he wants to go to the EPL league, but unfortunately the club seems to be burdening Osimhen's departure until he finally docks at Galatasaray.
This can be seen from the Osimhen transfer drama so far, because actually Osimhen's move to Galatasaray was not his main choice, but it happened because of minimal choices. In addition, Osimhen was also not included in Antonio Conte's squad because he had decided to move until finally Napoli recruited Lukaku as his replacement. Moreover, Osimhen's relationship with the club is full of drama, of course Osimhen's performance will not be optimal even though he is paired with Lukaku. So it is very natural that Conte finally chose Lukaku over Osimhen.