Although not truly "beta only", receivers of fast ring updates are gambling that all program releases are perfect right from the start. Most professionals don't like that "gamble". Waiting for a while, till the full release and all associated update fixes are available is the wisest for those who are looking for the safest option.
Hope this helps.
Hope it was windows 10. Backups are done so tomorrow is a reinstall day. Back to win 10 but not going to join fast ring again. To many problems an wasting good work time for no help. Even my MS 950XL phone crashes and twice a day. In for repair for a 3rd time. MS don,t care anymore about after service here in New Zealand.