My RISC-V board
I'm waiting for a small RISC-V board with SMP full support and a couple PCIe that's a little better supported by Haiku/OS, then I'll definitely go back to dealing with it (even to develop a simple kernel driver for MGA chip, Matrox, dual channel), on the front line, so even if it were unstable or full of bugs, it would be fine.
At the moment, however, I find the two MIPS boards from 1992 (R3000 32bit) and 1995 (R4000, 32/64bit) much more pleasing, one from IDT, the other from Algorithmics, things that have no { GNU/Linux, NetBSD, OpenBSD } support, and that's fine, as you program in assembly, because that's all you can do, but you relax more than using the last super powerful generation SBC for the same things you would do with your smartphone.
I have never bought an RPI. I worked on a couple of Allwinner ARM/32bit SoCs, and on a MediaTek ARM/32bit SoC, and I was very stressed by the terrible level of both the firmware and the kernel.
Well, comparing my experience with Allwinner and MediaTek: the second one is 5 times better!