I watch loads of series, movies, yet agree with text as preferable for most web circumstances.
Most people are barely literate. Literacy figures are based upon grade 6 reading levels, and that's average reading levels. So when you see 99% literacy rate, yes, but that's for reading stop signs.
It also pains some to read. You are doing them a disservice, to ask them to read.
Most adults, pre-internet, never read books, and only some read newspapers. Of those newspapers, many only read tabloids (high school reading level, barely), or looked at magazines with large pictures, quizzes, and such.
The rest often
watched 4 hours of TV a night, no reading required.
The modern internet does not want to exclude, profit is reduced if so.
So picture books for all!