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The real question is, why do people still disable Javascript? (And, why do browsers offer this option)

I use noscript, then white-list sites I trust (or am temporarily curious about).

The web runs so much faster.

No flashy adverts - static images are so much less distracting. A few places use animated GIFs, but they're a minority among minorities.

Because of security and privacy probably. All those tracking scripts, advertisments and so on.

Browsers do need this functionality for development purposes. Like checking how the website looks like for a search engine crawler.