I really like writing in plaintext. Whenever I write in Word, I am always stopping to fix formatting problems or tweak the styles. With plaintext, there are no styles or formatting. It helps me to stay focused.
All I need is a little Markdown (or HTML) to designate emphasis, headings, lists, and blockquotes, and I can plow through blog posts and memorandum drafts.
Text files are also my favorite answer to the problem of compatibility. If you have ever tried to create or edit a Word document on an iPad, you have probably experienced small formatting problems. Since plaintext files don’t have formatting, this is not a problem.
For these and other reasons, plaintext has been growing in popularity with non-programmers in recent years. This seems to be especially true among Apple users, for some reason. The App Store is overflowing with text editors, while last time I checked, there were virtually none in the Google Play Store, and only a few options for Windows users.