Agreed. I also find it to be a terrible ux so I am bias
Jumping between screen sections is annoying because lists and headings are too nineties and the hell with them.
Captchas? Should I mention that for some reason they disliked one of my logins and put an inaccessible captcha? Maybe your unhappy blind users are still locked out and can't tell you for their issues. Good that I was registered with a gmail account and circumvented them by adding a dot in the email field.
Those are personal experiences and I don't know your previous solution, but for me Discord manages to be annoying in a very specific and unnecessary way.
I agree on captchas. Rocket.Chat was the previous platform.
I will file a bug against discord on the timestamp issue.
When I worked for Washington State University, one of our tests pre website update, was the developers had to use a desktop with a screen reader and the display turned off. I think we made great websites for blind users. That was in 2003, so things may have changed.
PS: Regarding the timestamp issue, maybe I've formulated it incorrectly. Just, when you arrow on a message, it reads sender and timestamp. Some people write bursts of messages so you have a name and timestamp for every few words of the conversation and for many stupid emois.
But I guess I'll just put a blanket over the monitor. New OSes and GUI frameworks behave strangely with no target resolution.