I don't follow. What serious writer can't go buy a printer for $49.99 or pay less than $10 to have it printed? I'm assuming they would be writing their story on a phone that costs close to $1k or a laptop at the same price range.
I remember the 90s when my family was poor in a middle income country. Mailing internationally was a huge barrier, we didn’t even think about it as an option. It’s 2 dollars now, but still, there are a few 10 or 100 millions people to whom that’s too much. And of course, there is no post service everywhere in the world.
I mean I get that. My laptop was a Chromebook I got for $35 on eBay and then a MacBook Air I got for $75. But printing is not out of reach for almost anyone writing. Printing at the library is like 10 cents a page.