Thanks for the feedback, Donaven!
Tag Automations are still in in the early stages of development, and we're actively gathering feedback like this to shape their future. Expanding auto-tag functionality to work with guest records, like it does for Bookings currently, is definitely something we'd like to include in the future.
In the meantime, you can create a tag and have it apply automatically to the booking. When you see a booking with that tag, you can manually apply it to the guest record as needed.
