Had a client ask "can't I just use ChatGPT for this" mid-pitch. What do you actually say?

Was walking a small business owner through a lead follow-up automation and halfway through he goes "why do I need to pay you for this, I can just tell ChatGPT to do it." Fair question honestly. My answer was something like sure, ChatGPT can write you a good reply if you paste it in manually every time. What it can't do is sit in your inbox 24/7, pull the right context automatically, follow up on its own schedule, and not accidentally leak one customer's info into another's conversation. That's not a prompt, that's infrastructure. He got it, but it made me realize how many people genuinely don't see the line between "AI can write text" and "AI system that runs unattended in your business." Feels like most of the actual sales job right now is just explaining that gap, not the automation itself. Anyone else running into this a lot? How do you explain it without sounding like you're just talking down ChatGPT?