Right - there have been a few unique times where iOS has dropped later in the day, as I distinctly recall.
I also agree that 15.6 brings nothing to lose sleep over.
@phillytim
tvOS 15.6 (for the Apple TV), solves at long last the infamous Atmos issues that have been so prevalent the last few months, and audioOS 15.6 (for the homepods), fixes completely the Apple Music lossless playback issues (popping, scratching, and so on).
As for IOS, yes 15.5 is quite solid.