When you can't write well, you "resort" to using a lot of body language and facial nuances in face-to-face communication, which works acceptably. Unfortunately, this doesn't translate well on zoom.

This "writing well" as a form of good communication is needed, but while in school, those same people who cannot write well also likely were complaining about learning how to write essays and such. Over time, this sort of lack of learning has resulted in poor written communication into adulthood i reckon.

And with the advent of LLM and all these chatGPT-esque bots writing for them, esp. in school, the level of literacy skill is only going to continue to drop!

Don't forget the number of people who think they write well but don't. These type of people tend to litter their communications with ghastly MBA-speak, passive voice and super-tired business cliches instead of just writing in plain language.

Which is frankly appalling in this day and age. We write all the time, sure, the vast majority of it aren't essays or any kind of dense text, but expressing ideas in writing is something we do constantly.