alt Hacker NewsDOS is very much alive these days, though [0]. Text-mode internet is there (should you want online in the first place), and, thanks to some amazing devs, soundcard support has made a huge leap [1].
I use it every day lately (for text-related work and hobbyst-level assembly learning -- my intent is to write a small application to do paid work which involves chopping audio files). And -- I say a single-tasking system is a complete, true bliss in our days. Paired with a 4:3 Thinkpad screen, that DOS environment gives me instant focus for a long time -- which, to me, has been almost impossible to accomplish on a multi-tasking, contemporary-web-browser-equipped system recently.
Apparently, though, there seems to be AI for DOS, too [2]. :) I prefer my DOS machine to be completely offline, though. Peace and harmony for the soul!
0: https://freedos.org/ | http://svardos.org/ | https://forum.vcfed.org/index.php?threads/minidos-2026-relea... | https://bttr-software.de/forum/board.php