His saving grace on this specific front is that he has very, very good movement off the ball. In previous seasons when he was used as more of a traditional forward he was generating a high xG due to his ability to get on the end of chances. For instance the chances he missed tonight as well as one near one from a Mahrez cross were off the back of his movement.
At a similar age Sterling had a similar issue, good at getting on the end of chances but struggled to be too much of a rounded finisher. From 18/19 onwards he started adding more tools to his belt and now we see him score a greater variety of goals.
Something not helping Jesus from the perspective of those who doubt him would be that this season he's being used less and less as a striker and more as a false 9. Which means he's getting fewer chances so his goal return is going to be lower than before. On top of that there are the injuries and the fact we barely scored for 15 games earlier this season (that lowered everybody's totals), so it's easy to knock him as a guy that doesn't get goals.
It should be noted last season he got 23 goals and 13 assists in all competitions. 36 goal contributions for a 23 year old striker in and out of the team (1 goal as a sub) should probably suggest he has something in him.
He does need to make a step up in terms of finishing, more for his benefit really than anyone else's. You can tell Pep likes him a lot, but he isn't anywhere near as clinical as he ought to be, which is doubly frustrating because he's got the ability to be a lot better on that front. Right now he may be the de facto 1st choice striker but I don't think Pep fully trusts him yet (hence not starting against Liverpool) and I think it's solely the finishing that's doing it. Because given what he has to offer, if he was a fine finisher on top of that you'd argue Pep would be mad not to start him in as many games as possible. If he could dial it up just a bit I think he'd easily be 1st choice. Hopefully he's working hard at it in training, in which case we may see a bamboo-esque sudden growth from him eventually, a bit like we've seen with Calvert-Lewin this season.
We've seen the likes of Gundogan, Stones, Zinchenko, Cancelo, Rodri, and Bernardo make big step ups of sorts in their City careers under Pep, so it wouldn't be out of this world for another player to do it too.