I don't know how much programming experience you have, but let me tell you that bringing back an HTML dropdown menu is not a big deal. I don't know about "spite", but I would say it's either an oversight, or incompetence, or some grander goal to force JavaScript on their users for what could be termed "business-related reasons".

You picked up on "newer technology" as if it's pertinent to the matter. It is not. This usability checkpoint is still 100% valid today. I gave reference to that document to show that the matter is related to accessibility, and to provide evidential support to userbinator's view that the term has been hijacked by the web giants and munged up to exclude whatever is inconvenient to them.

You, like others in this thread, bring "disability" and "self-imposition" to this discussion. I dare you to imagine a world where not everybody who wishes to make basic use of GitHub is able, even if willing, to run JavaScript in every conceivable context. Can you imagine such a world? In this totally imaginary world this inaccessibility is not self-imposed. Given such a world, would you be willing to accept that my simple request is reasonable?