DeathArrowMAUI Is Coming to Linux
Accessibility bridging between .NET MAUI and Avalonia is currently limited.
Nowhere near production ready, got it.
Almost nobody needs accessibility; let's be realistic, it's obviously not a priority. The priority is to put this out the door (MVP style).
Unfortunately too many developers share your perspective. I'd be surprised if anyone building commercial software would move ahead without accessibility support though because, 1. it's required by law in many situations, and 2. it makes good business sense.