But all else is not equal, and this is what I find incredibly silly. You have a very strong prior on time when that is probably just one of many factors. Experience, efficiency, the ability to work well with others, organizational ability, and perspicacity are just a few of the several other things that goes into being an effective engineer.

Moreover you don't seem to balance your time prior out with others. Sure, time may have an effect, but what if this effect is marginal? This also gets down to something that bothers me about this line of thinking, which is the desire to create overly simplistic models of talent. Talent is incredibly multi-faceted, and hiring based on pithy narratives without actually looking at data is how we ended up in this situation where class signalling or age has become a substitute for talent.