> It seems to be rooted in the fact that these days people skim text, rather than read what is written. I don't know if it's because of general information overload, or a lack of attention to detail, or if the mindless scrolling of phone apps has trained us that visual impressions of words are good enough.

I think it is the former. I'm perfectly capable of reading a poem or code word-for-word, but as soon as I'm in my browser something "clicks" and I'm just skimming text. It is usually completely subconscious, but while reading your comment for example, I realized I was only reading half of each sentence.