Being optimistic before a season when Chaz Schilens is your #1 receiver is not the same as being optimistic before a season when Corey Davis is your #3 receiver. There are actual reasons for hope this year.
I think you summed up Q2’s 2021 performance pretty well. The main hope that I have that he can be better in 2022 comes from the fact that he had no preseason with the Jets at all last year, being a pickup after final cuts. He was pretty much thrown into the fire quickly due to injuries, without much knowledge of the system.
Maybe he can be more disciplined in 2022 after a full offseason of focused instruction (as opposed to gameplanning and on-the-job training), on top of the experience he gained last year.