I can't speak about other tablet constructors as I'm not aware of similar issues for them and I don't believe we did test on these hardware at the moment. As for Huion, we did multiples tests and even tried to fix ourselves the problem.
Problems with pen buttons mapping with different tablet brands were described in few posts on this forum, in threads you were active in, including this one (meyitzo mentioned his problems with dell like 2 or 3 posts above). So I'm pretty surprised you are not aware of similar issues with other tablets. Either they are completely different issues from programmer point of view despite looking the same from artists point of view, or, I don't know, not all the posts are visible to you? I bet it's the first, as I mentioned, I'm not a programmer, so I can only see the outside.
All the issues started after one of the updates as far as I'm concerned (with all the tablets I mean). All I know is, everything used to work, and suddenly, after one of the SP updates, it stopped. Now you tell me, that Huions drivers are causing all the problems (but they worked fine before). Worse, this thing goes for months, preventing me (and from what I know, not only me, and not only Huion tablet users) from using most up to date software, for which I payed (I mean, also for the updates, right?). And finally, as far as I understand, you tell me, that you (as Allegorthmic, not you personally) are not going to incorporate the same methods to make our tablets work properly as developers of ANY other software I use (not only Photoshop, but also ZBrush, Blender, Affinity, Krita), because it takes too much time as is too expensive.
As I mentioned, I'm not a programmer, and I only see the outside of the box. But I'm very disappointed with what I see. Let's wait for the Huion to fix the problem then. I don't see any point continuing this discussion.