Sorry but you must be thinking of a different player. Jesus is fully capable of striking the ball cleanly(he does it often), he doesn't always need much backlift to get his shots off(that's not his problem) and he has shown variation to his strikes(long distance, chipped shots, curling efforts, smashing drives, we've seen it all at points). Has he shown Aguero levels of power and lack of backlift? No but Aguero beats most strikers on those merits, that doesn't mean Jesus' ball striking isn't good though. So I don't know where most of what you say is coming from, it's like you're inventing problems to convince yourself you know the future. I'm not saying we don't need another striker, we do and I hope we get Haaland infact(but I doubt we will) but I do think Jesus has another gear to find all the same.
Like I said, time will tell. 24 is still young for a striker by most peoples standards. You say it's poor technique when he misses, I say what about the times when he finds the top corner or curls it around the keeper masterfully?... He shouldn't be able to do it at all by your logic. Or is it really you that's bringing luck into it, as in: "that was just lucky that time"?
I say the fact that he has shown all of the above, says it is a confidence thing but I do think to be considered among the best the key is consistency. Maybe he never will be that consistent, or have that amount of confidence against the top opposition often enough to put it another way. To say confidence doesn't often play a vital part in it or that he simply doesn't have the ability in the first place though. I'd have to disagree with you.