Hi there @braum,
Thanks for sharing your question with us! Happy to help!
While this feature is on our product roadmap for the future, using a segment is a great idea for a workaround for now! If you’re interested in coding a custom trigger for the form, you can check out this thread below.
If a user is unknown, for instance they haven’t opted in to a list via form or checkout page, then their profile wouldn’t be pushed in Klaviyo or be able to be brought into a segment. Until a user opts into your marketing some way, you won’t be able to track their activities such as abandon cart amounts or other store actions.
Hope this helps!
-Taylor