You can't let Reddit guide your technical decisions.

The FS was marked experimental, so there is no urgency in fixing bugs or providing features in a certain cycle. Everyone using it knows what they got themselves into. You can still provide the DKMS module for faster fixes and features for anyone who wants to use BCacheFS more seriously for the time that the upstreaming process takes, but eventually it would have all been on mainline.

Asahi is taking a similar approach where they have their downstream kernel and push things upstream once they are mature.

That means the upstream kernel is not useful for running on that hardware now, but things are moving there eventually.

No urgency over fixing bugs? What do you think this is, btrfs? :)

All this has been discussed to death, we don't need people armchair quarterbacking a year later. It's over, it's time to move on.