I see what you're saying, but considering what we're aiming for, we have to compare him to strikers of other top teams:
Benzema, Suarez, Firmino, Lewandowski and Aguero. All of those are capable of creating their own chances through using their own skill. Even Cavani isn't half bad and PSG have Mbappe ready to take over after him. Juve, with Higuain, are the only top team I'd say use someone similar to a poacher up top, but even that is balanced by the fact they have Dybala playing close to him. Obviously, it's not a prerequisite, as players like Kane are very good, but if the opposition can starve them of the typical 'striker' chances, as we saw against Spurs recently, they can end up looking fairly ordinary. That's a big problem as without that extra bit of magic, the performance of a striker will be heavily dependent on the rest of the team. That obviously goes for any player, but with a lone poacher, if the team isn't playing well enough to create chances for them, you might as well be playing with one less player a lot of the time as it's unlikely they'll do anything on their own. In clutch moments, I'd say it's important that, unless you're a perfectly drilled team in attack with a very clinical striker, you need all of your attackers to be able to pull something out of the bag and win the game. Goals like Suarez's a few years ago against PSG, where he nutmegged Luiz are an example of such. (can't remember how close it was when he scored tbf, but that's besides the point). If we want to reach that upper echelon again, I'd say it's fair enough to want Lukaku to do more in that regard.