What actually changes when you swap an answering service for software
The meaningful change is not who answers. It is whether you wake up to messages or to sorted, actionable jobs.
What changes operationally?
The output. A service hands you messages to return. An assistant configured properly hands you captured jobs, classified calls and completed bookings, which removes the second phone call rather than scheduling it.
What gets worse?
Genuinely unusual calls, and anybody upset. A good human handles both better, and any vendor claiming otherwise has not listened to enough recordings.
What should I keep from the service?
The escalation path. Knowing exactly who a call goes to when it cannot be handled matters more than what answers first, and it is the part most people forget to define.