What are the "other reasons"?
We run the BSD core because we're a three person research activity run by dinosaurs who had BSD systems in the eighties and stuck to them all the time since.
Now we are exposed to things like iscsi and ceph and Hadoop and elk stack.. and it's just too bloody hard to survive in ports on freebsd for this stuff. It's become corner case.
BBR is a case in point. Data fetch to the home nodes on bsd from Asia, Europe and the USA (we're in oz) was two to three times slower than via a Debian node because of it.