Some campaigns can be hard to (reliably) implement because they're dependant on state that's difficult to piece together from events alone.
For example, an "Abandoned cart" campaign might trigger based on adding something to a cart without placing an order.
But what if the cart content was removed, expired, or otherwise unavailable due to some other action there might not be any events for (or there are too many events to make a reliable workflow/automated campaign).
A simple Fusion endpoint that queries the current state of the cart, and that could prevent the sending of email in the case of empty carts would make implementing this kind of campaign trivial.
(Abandoned cart is simply an example, another one could be reminder mails for discounts that are about to expire but that might have been redeemed by another user)
