When running an autobook with “Ask me every time” arguments, you don’t really get asked every time.

You're only asked once, when you activate the autobook.

I see the value in autobooks actually prompting for input whenever I specify so.

For instance, in the case but I want the ability to opt-out of joining the meeting (or select which one to join, if there’s multiple).

This would also enable use-cases with "Right-click" trigger, like creating a Google Calendar event from any website and have a pop up to specify the details