Exactly mate. I am caring about my mbp 15" mid 2015 so much (it is still a beast imo). My plan is to wait until December 2022 and compare the newer 16" models and chase one on the used market. I am curious about the difference of the 2022mbp-M-Chip to the 2021mbp-M-Chip.
MY rule for apple devices always has been: When something "new" comes out wait at least for the 3rd gen product. (The 2022mbp would be kind of the third gen M-Chip based mbpb we would see...). But maybe I will also just go for the 20212mbp, if it supports multiple displays (at least four 4k monitors like the previous mpb) and all seems fine with it.
I am still on mac osx mojave with a 256gb ssd...

Cant wait for an upgrade