> Another way in which it's not cheap to lose sight, I guess.

True.

We can frame it even more strongly: "default societal practices actively discriminate against people with disabilities; they intentionally, consciously choose to make life harder for people who're disadvantaged".

> Another way in which it's not cheap to lose sight, I guess.

Seems like it would be a win-win to have a user setting to opt out of video in exchange for ungating that feature.