I have about 40 big graphs to upgrade. One issue is not being able to set section boxes of 3D Views, anymore. See Problem Setting Crop boxes and Section Boxes in Revit 2022 - #28 by truevis . That will take a bunch of refactoring to implement the workaround I found.
Older packages like Lunchbox may not work or install well. I tried to install the latest Lunchbox from 2018. but it does not show up in the Library. (A 2016 version shows up in the Library.)
Switching out depreciated nodes…
It is quite a big task to upgrade but I will get it done.