> I don't get it, so far as I can tell you still need to manually choose whether to RSVP? It's not like it's going to RSVP to all events for you.

The title itself does say "automatically apply to events".

I'm guessing this came about because many organisers have some sort of pre-acceptance filter these days, to minimise the attendee signal-to-noise ratio (which, stupidly, often relies on job titles).