I would if I would know that I wouldn’t have to redownload and reinstall everything because not even that can be guaranteed:
“PC Users: There is always a risk that you may have to re-install the sim when joining/leaving a flight, so please keep this in mind before participating. When the flight ends (date is TBD pending feedback), we ask that you manually remove yourself from the Preview. By doing so, you will get an update to MSFS with the latest public build. If you do not remove yourself from the group, we plan on automatically removing everyone at a later date. At that point, you will get an update to MSFS with the latest public build.
*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. We recommend that those who wish to test with us ensure your sim content is located in a custom path before joining the flight to avoid full reinstallations in the future (Details on how to do this can be found here ) . The best set up would be for your store app to live on the default C: drive and sim content on a custom drive.”
Not even Steam users can join the public test build 
I think that most of us know that MS/Asobo are lost in the sauce when it comes to these updates and testing, unless you in denial, just read the posts in this forum.