We can expect that in the future, more machines will get into this list, because many other companies, like System76 and Tuxedo target GNU/Linux systems with modern hardware. As long as we have at least a dozen machines, it’s good enough I think. I would prefer that the listed hardware worked flawlessly with Qubes. Apart from not disappointing the users (but see below), in this way we would support vendors who actually target Linux and not those who by chance (or by extremely hard work of volunteers) happen to support Linux more or less well.
Maybe not for you, but there are people with different needs and use cases. The list is created in the expectation that the machine can be a daily driver. It means working at night, watching movies on an external display and not rebooting for that, using touch pad comfortably. (It all works on my Librem 15, expect I did not test HDMI audio.)
This question has already been asked before:
You can put this answer in the FAQ below the table if you wish. This is the definition of “community-recommended hardware” in my opinion.
Don’t forget that the original HCL is still there and probably needs some love, i.e., good sorting and probably removing old Qubes versions (or putting them aside). The machines which work “well enough” for someone could be highlighted there, or sorted on top.