This is an honest question, not a critique - because I don't know enough about this space to critique it. I am trying to understand when this is useful. It is not complete enough for a full CRM (phone calls, customer centric rather than workflow centric interface, basic replacement variables like %name%, push/pull integration with other communication suites like google workspace without jumping through hoops with custom webhooks,etc). So it can only be a partial solution, and it is quite expensive if you need to jump up a tier from the base tier. I can't see why I personally would pay for it, and I would not use it as an open-source library for a business application with that relatively viral open-source license.