That's not true. I recently called to make an appointment. I don't care if it's an AI. I would actually prefer it, because I wouldn't feel bad about taking a long time to pick the best time. Don't you think you're being a bit dogmatic about this?
I have to feel that an online booking system is substantially lower tech than an ai voice assitant chatbot, and makes it even easier to ruminate as you pick the time that works for you.
In my case, the business did have human support assistants, but didn't do reservations via the phone. I had to switch to the web app for that, which was annoying (I was driving?). I guess doing user identification over the phone and scheduling the appointment are time-consuming for the human assistant, while these are some of the few things an app can do well. I presume the logic is to preserve human assistants for actually complicated or dynamic assistance, for the sake of cost-efficiency. A voice llm can bring down the cost of these basic-but-time-consuming interactions.