Awhile ago, the intro of the Pi 5 made it more of a serious choice for certain projects. The availability and cost of prior models during a lot of inventory problems, cost markups, and tariff shortcomings affected users getting one.
As this was happening, the x86-64 variants were catching up as well as the RISC-V development.
Leading up to the RISC-V work done on the HiFive Unmatched board by X512. There is the HiFive Premier P550 as well (i.e. possibly untested).
Other developers and “daily driver” users have “known working” IBM/Lenovo Thinkpads with specific working A/V, IP WebCam(s), Wifi adapters, and USB Audio devices tested. Ref: I got a laptop for Haiku
Other dev/users have custom workstations,laptops, SBCs, etc… with some hardware devices working or not.
So, available compatible hardware is not a major issue. The hardware compatibility lists exist for BeOS R5 and Haiku. Mainly, check if the needed hardware drivers prevent a release of Haiku R1beta6…