Accessibility is not just about vision-impaired users. It is about making your website accessible -- to anyone.

JS websites without fallback reduce accessibility for:

* Users with slower devices

* Users with dated devices and browser software

* Devices with poor connectivity

* Users who have JS disabled through no choice of their own.

* Users who choose to disable JS.

* Browsers which do not support JS.

* Accessibility software.

* Not to mention bots, scrapers, etc., who also have valid use cases.

This is a non-comprehensive list I came up with in just a few minutes. I'm sure there are many more items that can be added to it.

Not really an expert, but here goes: JS is for talking to computers, text is for talking to people. Accessibility, practically speaking, often means text-to-speech. At that point, JS is just gobbledygook in the way.