The book is not arguing that speed loses value. It is arguing that speed stops being a universal leadership signal. That difference is crucial for engineers moving between teams, companies, cultures, or levels of organisational maturity.
In one environment, moving fast proves that you can stabilise chaos. In another, moving fast without visible reasoning may suggest that you are stepping around the controls designed to keep the organisation safe.
Translation is about signal
Talent travels poorly when the signal changes. A behaviour that once communicated reliability may now communicate risk. The person has not become less capable. The system has changed the language it uses to evaluate capability.
That is why Chapter 1 ends with a warning: what worked in one system can quietly train you to fail in another.
The practical shift
Before moving fast, make the decision logic visible. Show what is known, what is uncertain, and what risk is being accepted. In mature systems, speed becomes more trustworthy when it is paired with traceability.
The work is not to abandon your strengths. It is to translate them deliberately.
Career lesson: Engineering maturity is not only skill. It is knowing how your skill is interpreted by the system you are entering.