I know quite a few people who use old form design software, old contact managers, old email clients, old text editors, old spreadsheet packages, old CAD software, and yes even old word processors because they prefer the interface. Of course “old” is subjective. There are WordStar, MS Word, MS Works, and WordPerfect for DOS. There are early Windows versions of Word and WordPerfect. There’s 1-2-3, Excel, and others for decades or one could go all the way back to VisiCalc. I know people who still use Mutt or Pine for email.