Use sequences properties and activity as Contact filters in Lists and Workflows

I would love to have this. Specifically, a contact property that let’s me know which sequence they completed (multiple checkboxes). Right now, there’s no way to filter contact to make sure that we don’t enroll contacts into the same sequence twice. Also, if we have sequences that are prerequisites to other sequences, there’s no way to keep that workflow organized.

HubSpot, please get on this!