Essentially all professional writers now write on screens. We all spend our days in front of screens. They're good enough.
Getting better, too. (HT98: Price, Xlibris; also Zellweger's Fluid Links)
People are always complaining about screens.
Yes, Jakob, paper is more usable than a screen. Unless the paper is in the Bodleian Library, and you're in Buffalo or Brisbane.
Unless the paper is in your desk drawer, and there's someone out there whose life it will change, but you have no idea who, and neither do they.
Screens are good enough. They're getting better.