Not necessarily in disagreement, but some points to consider:
* The nice thing about free software is that FreeBSD can benefit from Dragonfly's innovations!
* Dragonfly certainly would benefit from FreeBSD's (relatively) large userbase; but it could also be hurt, because FreeBSD's larger userbase would be more demanding of the kind of stability that could slow down innovation.
* ...and, likewise, FreeBSD might suffer if all those innovations harm the OS' reputation for robustness and stability.
* The nice thing about free software is that FreeBSD can benefit from Dragonfly's innovations!
* Dragonfly certainly would benefit from FreeBSD's (relatively) large userbase; but it could also be hurt, because FreeBSD's larger userbase would be more demanding of the kind of stability that could slow down innovation.
* ...and, likewise, FreeBSD might suffer if all those innovations harm the OS' reputation for robustness and stability.