Not every business needs a done-for-you build. The self-serve catalogue is the same reasoning and retrieval stack, packaged so an operator can point it at their own content and ship in an afternoon. It stops short of voice and CRM write-back on purpose.
Voice, calendar booking, and CRM write-back are not self-serve features here. Each needs credentials, an escalation policy, and an eval pass before it touches a live customer, and shipping them behind a signup form is how agents end up double-booking or answering a medical question they should have escalated.
The knowledge base you assemble on the self-serve tier carries over into a build — it is the same retrieval index. Most operators who upgrade do it when chat volume proves the demand and the phone line becomes the obvious next leak. Your first month of build fee is credited against self-serve spend.