I totally agree. Bots’ high availability (no installation, unified interface) together with the swift context switching are two big advantages of conversational interfaces.
I would add a third one: prior knowledge. If a bot (or the platform he’s on) already knows your home address and credit card number, then he doesn’t need to re-ask, even when you’re using a new service for the first time. For services with scattered, sporadic use, this makes a huge difference