RE: use cases for figure without figcaption?

Creativity aside ( :-) ), I am uncomfortable with the use of paragraphs
that are not accompanied by... other paragraphs.

As a rule of thumb, I have tended to use <figure> in cases where no more
than one or two sentences are required and where
the meaning is not dependent on immediately adjacent flow text (<p>s would
be better in this case).

Examples:

- slogans
- reminders
- messages
- errors
- alerts
- etc?