FS2020 (or ANY vehicle game for that matter) needs an export interface that is up to the job. I dare to say that at least 50% of FS2020 users will use some add-on that requests data from the SimConnect interface. I also understand that the overhaul of the export interface was not super high on Asobos To-Do list (not a release blocker at least), but at some point - I fear - it will become the limiting factor if it does not provide 3rd party devs adequate access to data.
Also the documentation deserves a little more attention than it has gotten so far, I think
That being said, there is some hope at least for those who used ACCELERATION BODY X/Y/Z in the past for use in motion cueing systems:
SEMIBODY LOADFACTOR X/Y/Z should provide the vehicles proper accelerations to the motion cueing algorithm. There is still some missing data there, but I will open another bug report on that now