2/ In case anyone cares: the "Avoid Debian Stable" thread on #LKML resurged with three more messages from Kent:
https://lore.kernel.org/all/2197543.irdbgypaU6@lichtvoll.de/t/#u
And FWIW in case you missed it: Jonathan Carter recently orphaned #bcachefs-tools in #Debian: https://jonathancarter.org/2024/08/29/orphaning-bcachefs-tools-in-debian/