The "<list>" stuff that I described were TinyMCE tags, not HTML tags. It remains true that the option to create a list in Annotum doesn't work right.
What I've done with Annotum almost qualifies as "nothing at all"; the articles were all imported from the Google Knol system. Only one of them have I tried to edit to any significant degree, and as a result had to break it into two parts, and even now I'm not completely satisfied with the way it turned out (mostly because of the lack of a code for linebreaks).
According to something I saw at the TinyMCE web site, it should be possible to tweak a background function so that when the user presses the Enter/Return key just once, a linebreak code is generated, and when that key is pressed twice, a paragraph break is generated. Who decided that for Annotum no linebreaks would ever be needed --and why can't that person be overruled?
This particular thread/discussion began when I started trying to do a brand-new article. That first message above (and the title) was a result of the frustration that accumulated, when preview after preview failed to look anything like I could get my text to look when using pure HTML.
As for switching away from Annotum, at the moment I simply want consistency. I'm not ready to move all the articles, mostly because I don't know enough about what "posts" will look like --and who knows what will go wrong and can't be undone?