Very often people with disabilities (and even people without disabilities ) disables the HTML editor, which currently does not is fully compliant with accessibility guidelines. This way people can use markdown, HTML or plain text format according to the selection made on the drop down menu appearing just below the editing text area.
However, it is needed to select the preferred format each time a text is entered. Would be really useful, especially for people with disabilities, to have a setting in the user profile were the preferred format can be selected once the editor is disabled.
Probably the current User profile drop down list "When editing text" could be used to specify the preferred format:
Use HTML Editor
Use Standard Web form - Plain text
Use Standard Web form - Markdown
Use Standard Web form - HTML
Use Standard Web form - Moodle Format
Once selected, when editing text the default format will always be preset accordingly. However, user can select other format in case of need.