Consider installing a screenreader and the Lynx web browser so you can demonstrate what it’s like to access internal apps/websites with those tools. It might help to record your experience so people can watch the demo at their convenience.
You're absolutely right. Aside from a few stubborn hold-outs, the blind people I know stopped browsing with Lynx, or Links or w3m, in the early 2000s at the latest.
I have no experience at all with screen readers. Is there a modern FOSS screen reader that would help give an idea of what a visually impaired user would realistically experience?
There's also the Orca screen reader for GNOME. And I believe TalkBack for Android and ChromeVox for Chrome OS are both open source.
If you don't care so much about open source, as I said elsewhere on the thread, Mac has VoiceOver built in (Command+F5 to enable), and Windows has Narrator (Control+Windows+Enter to enable on recent versions).
Disclosure: I'm a dev on the Narrator team at Microsoft, but I'm posting on my own behalf here.