[olliej]

Doesn’t work for people who can’t listen.

Doesn’t work for people who can’t see.

Doesn’t work for people in environments where the above two are essentially true.

25 minutes is still longer than 10 minutes (transcript, slides would be even shorter although less informative), and I was being conservative about reading speed.

[avodonosov]

People who can't see whould be unable to read as well

[RugnirViking]

however, if it were written in text, they can read by using a screen reader, which is very established techology by now.

This is not (as) available for a video if at least some component of the lecture requires being able to see