I agree with you. Conte is a good coach and I think Napoli have made the right decision by recruiting Conte. But if the club management doesn't give Conte a sufficient budget to buy some of the players he wants, I don't think that's a good decision. Club management doesn't want to spend big money but as you said, Napoli needs an experienced striker if Osimhen really leaves. But for now, Napoli are actually lucky to have Osimhen. He is a much better striker than Lukaku.
Napoli's management must think more wisely in terms of improving their performance next season because Conte's own performance will definitely be more visible and more fruitful for Napoli. And one of the wiser decisions is to bring in several new players, one of whom is a striker, so that he can partner with Osimhen if Osimhen does not leave Napoli next season. Apart from that, Napoli themselves cannot just be spectators in the current season of recruiting new players because their rivals are always looking for new players through the transfer market.
Of course, this will be done especially now that Napoli is in a downturn and their decision to recruit Conte is an indication of the seriousness of Napoli management to improve the performance of the Napoli team again.
As for adding new players, of course all coaches want that, but we don't yet know what Conte's decision will be in choosing the players in his squad. It could be that Conte uses the existing squad and adds just a few or carries out major changes.