I agree with you and thought the same thing. It's one of those intangible traits all senior developers should have. When I started as a developer, you tend to think senior means writing the most/best code and that's it. That should be a small part of it, absolutely. However, if you're not making those around you better, you're not being the best you could be.
It's the classic case of: a 10x developer doesn't produce 10x the code, they influence the 10 developers closest to them to produce 2x the code.
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