>>Because text is asynchronous, and persistent. Text is a weak medium, but with specific strengths which can beat others in certain situation if they can played well.
It is indeed async & persistent, but those are not it's only strengths.
Text is ALSO highly searchable, and skim-able. I can search and jump right to the point I want, I can rapidly skim through parts I'm not so interested in and then focus and examine deeply and repeatedly the part that is of interest. Or, I can read it sequentially like a video/audio stream. In contrast, searching vid/audio is cumbersome, frustrating, and time-wasting at best.
Text is ALSO has a much higher information density than video, except for situations where moving pictures actually add to the information, as in video of a specifi event, mechanism working, etc. Most of the time, just listening to a talking head is far slower, and harder to remember than reading (where I can read rapidly forward, then back and re-read key bits, often without even thinking about it; w/ video, I'd need to interrupt the train of thought, hit [back], try to go back just the right number of seconds, then re-view, etc. - useful ONLY when the vid id of an event, not of just reading info.)
Moreover, text is more direct. To make a really good video usually requires a well-thought out script written in advance, from which one reads - I'd rather just read the script. And when it is something like an interview with a noted expert, I'd usually rather just read the transcript, for the above reasons.
You actually highlight the problem with video:
>>There will be a high chance of 90% of the content just being halfassed trash.
Absolutely correct - most of it will be rushed out without the solid base of a test-based script and screenplay, which would in most cases be preferable...
Text really is —still— one of the key defining inventions of humanity, and I have no expectations that a "metaverse" will beat it soon. (Now if it can start reading text directly out of my brain without typing/dictating, and I can edit it on the fly — THAT will be really something...)