[hakfoo]

The assistant platforms fall back on web search because they want to pretend to be omniscent. If it said in the documentation "here are the 1,602 commands explicitly supported, the data sources it pulls from, and anything else goes to an error message", it wouldn't be magical anymore.

Less magical might be a far better bargain for the platform brands, though. It's literally the face (err, voice) of your brand, and you're fighting a completely adversarial war here. At best, you've got unrelated external data sources that could make it say something stupid, but there's an entire spectrum of bad actors with incentivization to get Alexa/Siri/Google Assistant to say something offensive, scandalous, or hazardous.