At the end I still returned the Shine 5 because the small front-facing LED kept shining for no reason. I don’t know if it was hardware related or happened because of the firmware switch.
Which sadly does not work very reliably. At least on my end the selection changes back to default every few days. I reported this issue over the Apple Feedback app already…
I noticed that homebrew updated _all_ my casks when running 'brew upgrade' (even those with "auto_updates: true" in their Cask JSON API).
Is this intended, new default behavior? This did not use to happen...