It depends on how you use it. If you want to make ASCII tables, then a screen reader will not have an idea of how to navigate the table. However a simple HTML <table> is well understood by screen-readers. I would contend that properly structured HTML documents are far better for accessibility.
I disagree. What it doesn't offer, people will try to do anyway, each in their own ad-hoc way. See how people used to abuse <div> before HTML5 (and still do)
What it doesn't offer makes a significant chunk of content that people actually write and read inaccessible.
For example, the lack of simple text styling makes Gemini significantly less accessible than it could've been. Because now a screenreader will say something like "Significantly asterisk less asterisk accessible" instead of "Significantly emphasis less accessible".
I don't think images can have alt-text in Gemini so that blind users could get info from there.
It depends on how you use it. If you want to make ASCII tables, then a screen reader will not have an idea of how to navigate the table. However a simple HTML <table> is well understood by screen-readers. I would contend that properly structured HTML documents are far better for accessibility.