Today I may found this feature useful for sections like:
FAQ Component
Instead using a query to fill the data to be possible to do directly in the editor or Gutenberg (using bricks components in Gutenberg) so users can fill undeterminated number of questions
I was also trying to build a component for an accordion where you can repeat items as many times as you’d like but noticed this was currently not possible due to the fact there’s no repeater prop. This would make components much more useful in Gutenberg. Solving this with slots isn’t very good in terms of usability.