Accumulating 'years of experience' alone does not make someone a great developer but rather consistent growth and seeking new challenges define true expertise.
Many developers stick to their familiar toolbox when faced with new challenges, leading to brittle solutions and hindering innovation.
Repetition without reflection leads to stagnation and a lack of true understanding in development work.
True experience in the industry involves continual learning, adaptation to change, and understanding rather than just 'doing' the work.