I really don’t care.
I’ll conclude by reminding the readers that HA users at no point are required to get a GitHub account to use HA. Some third-party extensions available for HA can require a Github account, but overwhelmingly most do not.
HA development, on the other hand, categorically requires you to have an account there. Requesting a ZHA device handler is most decidedly a development activity, not an activity that a regular user would do ordinarily in the course of using Home Assistant. It is perfectly reasonable for a person trying to do that to be expected to have a GitHub account. You want code to be changed or want to make code changes yourself? If you want that code change to be tracked all the way into the codebase, then we expect you to use GitHub.
If your complaint is that ZHA device handler should be handled on the forum because they are a user activity and not a development activity, then you’re just factually wrong. If your complaint is that home assistant and the Open Home Foundation use GitHub at all for any purpose, then that’s a different complaint, which you will have to take up with the folks who run the project.