Curiously, the reasons that you use OpenBSD are the reasons that I use Linux, it Just Works for me and I've had problems when trying to use BSD.
As I talk to more people about it, there seems to be a growing pattern that, it's just whatever system you grew up with is the one you're most comfortable with, and is the one you're most likely to use going forward.
I grew up with linux. Back when slackware was king. I've always found it to be a constant source of irritations and problems. I tried out openbsd in 2001 or so and immediately jumped ship. And since then linux and most distros built on it have only gotten more complex, while openbsd has not. There is definitely more to it than "whatever people are used to".
As I talk to more people about it, there seems to be a growing pattern that, it's just whatever system you grew up with is the one you're most comfortable with, and is the one you're most likely to use going forward.