Messaging isn’t an application, it’s an invisible interface
Bots, messaging, and the Interface Visibility Scale
Ryan Block
1998

I don’t agree messaging is entirely invisible according to your definition: it might be immediately intuitive for most users, but typing — especially on a touchscreen — is an incredibly high-friction action.

Tapping an icon to leave a channel in Slack is much lower friction than typing “/leave”, especially with auto-(in)correction.

I also wonder if the law of leaky abstractions will rear its ugly head when the limits of the AI behind messaging-based UIs are reached, such that systems frustratingly fail to understand commands which might seem incredibly clear to the user and other humans.

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