Checklists in Rich Text fields have some quirks that make them unnecessarily cumbersome, compared to e.g. how Bulleted Lists work.
When the cursor is at the beginning of a non-blank line, inserting a Checklist (by typing “/k ENTER”) creates a NEW empty Checklist BELOW the current line. It would be preferable to instead CONVERT the current line into a Checklist (as happens with Bulleted lists and everything else).
When the cursor is at the end of the line on the last item of a Checklist, hitting DELETE does not append/convert the following line into the current line (last Checklist item) as expected.
Checklist items/lines cannot be converted into other paragraphs types (headings, bulleted lists, etc) without first changing them into a regular paragraph.