When commenting in Flow topics, users can define whether they want the visual editor or the wikitext editor.

When using the visual editor, a square brackets "{{ }}" icon is visible. Good. However...

EXPECTED
When using the wikitext editor, a Pencil icon would be expected, just like the actual VisualEditor does for regular editing.

ACTUALLY
The square brackets icon is still visible, which makes it difficult to know in which mode you are.

I found myself typing "* " or "[[" only to see whether the editor reacts (visual editor) or not (wikitext editor).