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The process described is not narrowly focused. It's full system design, implementation, and validation. Engineering is more than just coding and can be much more satisfying.

I'm sorry, but that's such a narrow view of things. Different people are attracted to different kinds of jobs. What they described is essentially my dream job. I hate the haphazard way modern software is written - it's not engineering at all.

> your brain will rot from being so narrowly focused on this one thing

It depends on a person. Many people work on the same ideas for dozens of years. The "try everything" approach to work is relatively new.