That's a consequence of that software being written with only Linux in mind, not a problem with the BSDs as such. Also, somebody needs to write a port, and the only person who'll do that is somebody with skin in the game.

Obviously I'm an outlier, but if I need some software on FreeBSD, I'll contribute a port. Most of the time, it's almost trivial, and it's only with very obscure (maude is one that I'm currently working on) or newish (RethinkDB, which isn't written in a super portable manner - it doesn't even use pkg-config and has a hand-written configure script!) where there's an issue.