The front desk cannot keep up, and the easy channel is the one you cannot use
In a private office almost all the message volume is the same thing repeated: what time is my appointment, can I change it, where are you, do you take my insurance, do I need to fast. None of that needs anyone with clinical training, and yet it eats the day of the front desk person, who is also serving whoever is standing at the counter.
The temptation is obvious: move all of it to WhatsApp, where the patient already is. And that is where almost every vendor in the field looks the other way, because the honest answer makes the sale harder.
The honest answer is this: WhatsApp is not a channel fit for health information, and not because it lacks encryption. Meta does not sign a business associate agreement for WhatsApp, which is the document without which, in the United States, a practice cannot pass protected health information to a vendor. And WhatsApp Business's own messaging policy says so in so many words.
What can be done (and what we do) is design the assistant so clinical information never enters the channel. A patient can confirm they are coming Thursday at ten without anyone ever writing what the appointment is for.