I'd be really interested to hear if any arm64 or other RISC architecture laptops are useable! M1 is a step in that direction, it would be really surprising to me if it worked well beyond basic support yet however. Asahi linux took like over a year to get to that point but it sounds from reading that link that they're pretty gung ho on getting it working for 7.1 which is amazing to hear. It sounds like other hardware support in those laptops is the big thing.
Fun miscellaneous stuff: SMP on intel architecture is disabled on openbsd for security reasons, so looking at alternatives to make things go fast with guarantees for that is big right now.
To add to that, if you need the (max ~30%) performance boost (less on OpenBSD as a some parts of the kernel are still poorly performant in SMP scenarios, it's improving but still noticeable), it's possible to enable hyperthreading temporarily via
doas sysctl hw.smt=1
I do this occasionally when running larger compilations (LLVM or similar). If you want it enabled permanently you can add
You could probably ask their support, they are very good at responding.
That being said, they use coreboot and hardware with open/well known drivers. I actually bought a Librem 14 and installed Windows on it for my spouse, and surprisingly, everything on it worked out of the box.