That does not match my experience with obsd. It is not so much minimalism as they are not afraid to reinvent the wheel. A obsd install is full of services, more than most linux installs I have seen.
For example you can imagine my disappointment when I discovered what a pain in the ass it is to get a pflow producer working on linux after doing the first one on openbsd.
I'd say it's true. They chose to not implement SMP until consumer CPUs surprised them by going multi thread.
And obsd has no Bluetooth, right? A pretty big subsystem to drop because security.