They do not replace you, and they are not allowed to make promises on your behalf.
They never quote a price, commit to a date, or agree to scope that you have not approved. Anything outside the script goes to a human, which is usually you. I would rather a system say "let me have Andrew confirm that" than invent an answer that costs you a job or lands you in an argument.
They also do not fix a business problem underneath. If the phone is not ringing at all, answering it faster changes nothing, and I will say so rather than sell you a system. That case starts with the search and website work instead.
No guarantee of a specific number of leads, bookings, or reviews. What I can commit to is that the systems do what the scope says, that you can read everything they said, and that you can switch them off in a day if you hate them.