Gotta disagree with you on your minimalist verdict, out of the box openbsd tends to have everything and the kitchen sink, I am not complaining, it is good solid well written software. but I have never found a base linux distro that was as well stocked as a base openbsd install.
a c compiler
a web server
3 routing daemons(bgpd, ospfd, ripd)
a mail server(smtpd, spamd)
a sound server(sndiod)
a reverse proxy(relayd)
2 desktop environments(fvwm, cwm)
plus many many more
Openbsd is not some minimalist highly focused operating system, I mean what on earth is it actually for? based on the included features, A desktop development system that is also the router and office web and mail server?
Personally I love it, after a fresh install I always feel like I could rebuild the internet from scratch using only what is found in front of me if I needed to.
They are mainly window managers, that is their primary interface, but they also launch programs and show status, so I think of them as fat window managers and because they tend to be the only environment on the desktop, they are thin desktop environments.
Compare cwm with xfwm. while cwm is brutally minimalist in appearance it has enough extra functionality to be used as it's own desktop environment, xfwm requires several separate parts to be usable on the desktop.
Personally I love it, after a fresh install I always feel like I could rebuild the internet from scratch using only what is found in front of me if I needed to.