I have to agree with you. And generally do think a player like Lukaku is so clinical that he will score as long as service is provided. As we currently stand his service is just not there and being a numbers game, if Lukaku has many more chances on goal he will convert more, it's what he does best. Pogba, Zlatan, Lukaku will have chemistry. Pogba's forward passes from mid third are fantastic and Zlatan has that split vision and track record needed to do the same in the final third, people forget he was schooled in one-touch football for his formative years in Ajax. Lukaku, much like Trezeguet did in Juve will put a lot of balls in the back of the net with that kind of service AND will look WC while doing it.
I do get the appeal of fast agile press play, fast transitions etc like Bayern treble team, but Mourinho is a modern pragmatic variety Catenaccio coach and has reshaped us in a physical 1 goal win way, our defensive track record speak for it, we just need a steady supply of goals and will go all the way once that happens.
Given all that, in today's press style play Zlatan do get dispossessed from time to time and it might just not work for many reasons. It will probably be tried in low importance matches, late subs, overlapping subs, training etc before going full Live. I just don't see Zlatan going ACL-surgery to 100% that fast, and coach said so already. Mourinho has the winning instinct, he is no fool, more options are better than fewer options.