> I assume you could have just as modern and featureful experience with cvs as with git
There are strong mindset differences between various software communities; it might takes a little bit of time & effort to appreciate a more frugal/conservative approach to software engineering.
The previous links highlighted some aspects of those mindset differences. [0], while unrelated to OpenBSD, is another good illustration.
That's to say, OpenBSD people probably don't care much for a more featureful experience: it won't make them more productive, even if it may look like it would from the outset.