Prose thrives in the terminal. Ice and Fire was written in WordStar, as just one popular example.
He's averaging a hundred pages a year. Maybe not the fastest, but certainly not the slowest writer. With the size of his books... Cut the guy some slack.
Seems like people have cut him a lot of slack already. Of course he doesn’t really owe anything to anybody, but at some point he and everyone else has to face the reality - which is that if that book is ever published, it’ll be posthumously, finished by a ghostwriter.
I can't find the link but I think at some point she compiled her own nano with some "helpful" feature patched out again.
For starters, there's your assumption that there is "syntax" to be highlighted. Not every text file is something written in a computer programming language.
In fact I'd put money on it, but sadly do not have any evidence to back it up.
If you have evidence to the contrary I'd be intrigued!
But these are amateur geeks or geeks in the making who probably don't mind having the capability of syntax highlighting built in, even if for some purposes they want it turned off.