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Same as why everyone is using QWERTY keyboard when there's no scientific evidence that this particular keyboard setup is king.

The benefit of everyone using Qwerty, though, is apparent.

So same with 9am starts. So that the team is together at around the same time, for example. This can be overcome with proper communication channels as in a remote worker setup, but that's a special case.

Sometimes the effects can justify the means.

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It's also not just about internal communication it's about other companies and partners you deal with being available at the same time. While email can allow people to offset communication due to its asynchronous nature, a lot of businesses are still run primarily over the phone.

If you're a service provider, there's a big advantage in being available at the same times as your clients.

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