This is something that find has that would be very nice to have.
Thank you for your feedback!
In my point of view, searching for empty files/directories is a rather niche use case and I would only consider adding it, if there is a strong support for this (see the part about "80% of the use cases" in the README).
Also, I would like us to think about alternatives to a new --empty command line option. One option could be to extend the --type option with a new "empty" type. Another option could be to use --size 0 (if we decide to move forward with #276).
Released in v7.1.0, see #319 for details.