So how come my updates are a few gigs each time, and always have been, and I have never had >100GB “updates” reported?
This seems to happen to some users, but has never happened to me. I have read that it can happen if you are forcibly ejected at the end of beta participation, and also if you have installed the sim on your C drive, and not D or elsewhere. This is documented somewhere, so I will look for the thread now.
If you have MSFS content installed completely on a custom path, you will have a much lower chance that a full re-install will be necessary when the update is officially released. However, if your sim content is installed in the default path selected by the in game content manager, you may have to reinstall the whole sim when moving from the test build to the public build.
It’s at least one possiblity.