Dragonfly has superior architecture, performance and security, despite its much smaller team. It is a textbook example of how a small team of focused competent engineers will deliver higher quality than an heterogeneous large body of developers with no focus. They are actually scaling in a manner competitive with Linux, unlike the other BSDs.
When Matt left Freebsd, which was due to a conflict that spawned over bad technical decisions, many good developers followed him.
What was left did implicitly support bad decisions. Fine-grained locks for SMP do explode complexity and makes writing quality code that much harder. It is also a problem in Linux, which compensates with sheer manpower.
Freebsd has been a cesspool since then. Jesus, what a mess Freebsd has become.