It doesn't take a lot of genius, time, or money to set a link w/ url parameters or use a standard html form for e.g. upvoting or comment submission, and then override that with javascript for fancier UI / AJAX / avoid redirects, etc -- i.e., extra polish, rather than it being the only option and the site just becomes nonfunctional instead of degrading gracefully.

This benefits more than just one tiny group of users: it might also aid disabled users and accessibility software (not to mention the developers of that software), security nuts, people who turn js off to improve performance on low-spec machines (it's 2018 here, but more than a few countries have a four (or even three!) figure GDP/capita, so their machines aren't going to be 2018 machines. This is just off the top of my head, how many other groups might there be that would benefit?