The more niche you go, the less flexibility with your software. If you don't care about using a zillion different programs for your profit, OpenBSD is wonderful, not to mention than gaming and OpenBSD are like oil and water.
It's funny that almost 0 used Linux and Mac felt the standard of security more than a decade ago.
Nowadays, Mac super popular is completely broken and Linux with a 99,99% of server dominion the same.
OpenBSD is the new underdog, not because it's the most secure, but because it's not used by anyone but 3 freaks.
When I want to do something secure, I go to my armoured cabinet in the middle of the mountain, with my Windows 3.11 PC completely disconnected from the Internet.
And the most secure I do is watching pr0n.
Meanwhile, I write in this forum from my full-fledged Windows 10 and have my account pass-hacked like it was 2 years ago with a guy sending fraud PM to others on my behalf.