Some people shit on Thuram, but I think his existence gave more shooting chances for the midfield or I should say rest of the team in short; I think his focal point isn't scoring btw. It is more a point for forward passing - providing more than just a target man, like he can run into space to receive and he can also retain possession not in a static way like Lukaku, force movements for the opponents. He is rather very good for the team, especially if we are playing 2 strikers; he is definitely not a world beater right now, but he has potential to play like Kluivert if needed, however, don't think our team is trying to set up like that.
I don't see how this is a problem, cause normally we won't need a striker to score 20+ goals if the goal scoring spreads across the team a bit more even. For Lukaku under Conte, we pretty much create all the chances for the strikers, which is a very different approach, but we can only play like that if the strikers are at a certain caliber, which I have to give some credit to Lukaku here, but in modern days, we don't need a striker like that, and most strikers aren't like that, and it can still work.
Also keep in mind he is still integrating to the team.