Is that just a general question about servers? If so, you're probably right.
However, OpenBSD is frequently used as a firewall or router. So if a developer has an itch to scratch, and it's within the bailiwick of what OpenBSD is generally used for, then why not have it?
My day job is networking for a UK ISP/DC, and the only thing I could really think of people wanting this was on devices like route reflectors within your network, or an peering exchange.
However I suppose people are just using OpenBSD to do more than I thought.
-Results of audits or how they got bizarre bugs to surface with security features/randomization/running on exotic hardware platforms. -Security mitigations and software hardening as they find potential attack surface -Recreating the most common use cases of a common piece of software with <5% the codebase.