From
this job posting for an API Technical Writer (sic):
"Our ideal candidate [...] Comfortable authoring in HTML and XML using plain-text editors (no WYSIWYG)"
That's how I work all the time. I didn't know anybody else cared. :-)
(Because (1) after 30+ years the emacs muscle-memory is strong; (2) it means I actually know the spec (at least the important parts); (3) I don't have to clean up after tools' bad decisions about what I meant.)