What does "behind" actually mean, though?

Think about how far Linux has/hasn't come in the last 10 years. The user experience is nicer, drivers "just work" more, there's more support for more stuff...but at the end of the day, the actual computing experience is mostly the same today as when I installed Debian back in 2016. It's polish, interoperability, etc that's improved.

Maybe VR takes off and takes over the desktop, and then openBSD can't keep up with that, but I don't think that's likely. So what are they trying to "keep up" with?