The diary manufacturers ‘Leuchtturm’ have a nice slogan: “Writing is thinking with the hand”.
Of course a company selling - expensive - notebooks would say so. But I really think it is a difference whether you write a text by hand or type it. And then again a difference whether you type a text into a typewriter with foolscap - or type it into a word processing application that can effectively make any text look like it was professionally written and edited. In our day you had to know what you wanted to write, where your sentence - and the point of your argument - was going.
Do younger folks no longer communicate because of this? I suppose they communicate differently. There’s the bonmot - or is it a truism? - that irony doesn’t communicate over the Internet. Maybe therefore many users regale everything with irony indiscriminately, which then loses the point of it entirely.
For the purposes of the net, where so many discussions are not in fact about a topic but about making a statement that generates a reaction, any reaction, exchanges could entirely happen with emojis. That would still be communication, even though sender and recipient on purpose leave aside much of the information content.
Frankly, I have no good idea how to change this; I’m not even sure it needs to change when folks apparently are happy to forego the basic rules of language. Make kids write diaries with hand again? Make ‘Written Language’ a high school subject? I really don’t know.