"need" is moot. I want it, but in general release. I don't want to have to maintain kernel independently unless I get a strong signal of other benefit (eg better ZFS/Memory tuning)

I run a clutch of Dells, on FB and they're moving to Debian for other reasons, where I get BBR. I would have fought harder to retain them on BSD if we'd had signs the network stack was getting the same amount of attention.

When VJ moved to coding against Linux instead of BSD, I think the writing was on the wall. When Grenvilles team in Melbourne disintegrated, and that source of TCP energy dissipated, the writing pushed the wall over. (I think they moved to netflix)