What makes the conversation different
Most companion platforms tune replies to be reassuring and agreeable, which eventually flattens every character into the same warm assistant. Joi's character pushes back occasionally, changes topic naturally, and reacts to specifics rather than generic compliments.
The effect is that a ten-minute chat feels like a real getting-to-know-you conversation rather than a scripted exchange. That's the platform's real selling point, and it's strong enough that the small catalogue matters less than you'd expect.