Most people don't judge content based on information density.

It's well known that not everyone does best with text. It's why most college lectures have a text/notes, a lecture, and a discussion component. Some value the interactivity of the discussion, some the audio of the lecture, and others the text itself. For the longest time the internet mostly gave value to people who preferred to interact in text. Now the internet is wide open to give value to people who prefer interacting in discussion, video, audio, and more.

TikTok and IG are mostly for entertainment not for learning, not sure how efficiency apply. Also we are talking about an instant stream of short clips, not old school YT where launching a video requires clicking and waiting.

Human attention generally isn't zero sum like that, so I've always been puzzled by this perceived "war" against text on the internet. People who previously didn't want to interact in text probably only used the internet sparingly or only used the internet for certain tasks. I've always been great at interacting with texts but had a strict rule not to try to learn mechanical skills on the internet and checkout picture books from the library, or better yet ask an experienced friend/professional. Now I can pop up Youtube and find out how an electrician changes outlets in a home. I now strictly do more things on the internet.