Lukaku puts the round thing in the square thing tho, thats all that really matters at the end of the day.
People often over complicate the whole role of a player: especially strikers. Pure and simple, a striker's primary role is to score goals.
If they're scoring goals then it is difficult to question their influence. Maybe you'd like them to do more in other areas, but that's less important.
On the other hand, if they're not scoring then you have the right to question other aspects: maybe they should work harder; move more et al.
Lukaku hasn't been perfect this season on a number of occasions and he's still scored. Really that merits some level of praise.
If he improved other aspects of his play then arguably he could score more, yet that's another point entirely and opens another discussion.
I remember arguing with a Kopite about Ruud van Nistelrooy. He proclaimed that he was, 'lazy, hardly moved from the box and didn't contribute'.
I pointed out he scored nearly 100 goals in 150 games; stats of just over 0.6 goals per game. He may stand around a lot, but he scores.
He didn't seem to understand the point I was putting a cross... maybe he was stuck in Emile Heskey contribution mode.