Does that mass-market consumer product have proper accessibility support, e.g. for blind users? If so, is that somehow implemented within the Flutter UI, or parallel to it (e.g. as a separate voice interface)?

I think the parent comment was talking about Nest Hubs / Google Homes, which are arguably voice first via the Google Assistant. I can only imagine but if I had, much more significant, vision issues then I think I'd use it even more.

Which product is that? I didn't realize Flutter had a Linux dominant product already.

Not the OP, but I have heard that the google assistants with screens run Flutter.