From my perspective, it means it has been deemed ready for fresh installs — which aren’t uncommon. They have, especially with Apple, fewer configurations to tes

From my perspective, it means it has been deemed ready for fresh installs — which aren’t uncommon. They have, especially with Apple, fewer configurations to test. But the probability that they got a good enough sample for system upgrade is very small. Systems that have been in use— especially for a few years — tend to diverge widely. The users who upgrade should wait unless they are willing to risk the small but not negligible probability that the upgrade will Bork their system.