To be clear, GPUI Kit is not the same as GPUI. I am not sure if Discord is using GPUI Kit, but accessibility natively is possible with either.

It's reasonable to be concerned that Discord may not have focused on accessibility while rewriting.

It's less reasonable to be concerned that it may be impossible to write accessible apps using GPUI, as that is now possible (https://github.com/zed-industries/zed/blob/main/crates/gpui/...) although this is a fairly recent addition.

It's also less reasonable to assume that an app made with GPUI Kit will automatically be accessible. You still need to put effort into it.

I don't know why people are ignoring the pink elephant here. For medium scale projects, like a Discord app is going to be, LLMs are now at a superhuman level of competence, including on higher level architectural/structural type decisions. I would be beyond surprised if the rewrite wasn't largely done by Claude (or similar). And in this context accessibility is also just a prompt away, if it wasn't included from the get-go, which it probably would have been.