I go back to take a look at the BSDs every now and then and frankly it really looks like that mindset has stayed, somehow.
Generally speaking the BSDs seems really fork-a-phobic and it kinda shows given how little dynamism is there in the development those systems.
Even the Solaris derivatives have a faster tempo.
GhostBSD DragonflyBSD pf/opn sense even funky hybrid stuff like Chimera Linux, out of curiosity I had a quick search and the list goes on https://github.com/DiscoverBSD/awesome-bsd
Linux has a lot of corporate sponsorship and its own legal hurdles of the past (SCO le sigh.)