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i have experienced a lot of people who have convinced themselves they are adding value despite not coding, yes

System design isn't coding and reviewing all designs across 40+ people and leading cross team tech initiatives is a full time job.

What makes you say they don't even code? In my experience coding is indeed drastically reduced, but high level ICs still regularly code.

Looking at their commit history.

As an addendum to "communicating" is documentation. That said, plenty of those who do document/communicate well can still suck at teaching/training at a higher level.