I can’t really imagine a benefit to --autoremove except for keeping old packages a bit longer before removing them.

Eg, if you run apt --update --autoremove upgrade -y once a day you’ll keep your prior-to-currently-running-version kernel packages a day longer than if you ran autoremove immediately after each upgrade.

To make things more confusing: the new-ish apt full-upgrade command seems to remove most of what apt autoremove wants to… but not quite everything. 🤷