The web was enabled by a totally new type of meta-application: the browser.

The browser was unlike other applications because it was fundamentally open-ended.

For the first decade of the web, "What's the use case of a browser" had no clear answer.

It was like the Matrix: you couldn't be told what the web was, you could only be shown.

Anything that is open-ended doesn't have a killer use case.

This is why platforms don't have killer use cases.

The web and browsers allowed safe, zero-friction teleportation between, and composition of, untrusted content you'd never seen before.

The web enabled whole new classes of software that were previously unimaginable.