Grounding is the whole game. A general-purpose model asked about your refund window will produce a plausible-sounding answer whether or not it knows one. A grounded chatbot retrieves your actual policy page, answers from it and links to it. That is the difference between a liability and an asset.
The second thing that matters is a genuine “I do not know” path. Customers forgive a bot that says “I cannot answer that, let me get someone who can” far more readily than one that wastes three minutes of their time being wrong. We tune for honest fallback over apparent coverage.
The third is that your documentation becomes load-bearing. If the pricing page and the FAQ disagree, the chatbot will find that out and so will your customers. Most of the projects we run surface a handful of content fixes in week one, and that clean-up is worth having regardless of what happens with the bot.
We are also happy to tell you when you do not need one. If you get twelve enquiries a week, a well-written FAQ page and a contact form will serve you better.