Several reasons. If you want to optimize for flow (which makes sense if you want to shorten time to market), it makes sense to have <100% individual utilization. Maybe 80–85%.

If you are interested in understanding this, here’s a resource about Lean (which influenced the Agile Manifesto authors):

Watch the baton, not the runner.

Agile coach and developer. Follow me on Twitter: https://twitter.com/BertilMuth

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