Steps to get confused with SET:
- Edit an article for the first time. Choose the visual mode.
- Leave a note on the talk page, where visual mode isn't an option.
- Go back to the article. Where's the visual mode?!
If I'm happily editing in the mainspace with the visual editor, then being forced to use the wikitext mode on a talk page should not switch my mainspace editing experience to a wikitext editor.