The "barrier to entry for building software" has not collapsed, as it was never about "where engineering shifts from writing code to shaping systems". It has always been about understanding the problem to solve and doing so in a provably correct manner.

Another way to reify this is:

  When making software, remember that it is a snapshot of 
  your understanding of the problem.  It states to all, 
  including your future-self, your approach, clarity, and 
  appropriateness of the solution for the problem at hand.  
  Choose your statements wisely.