> Lots of developers will find it much more interesting, challenging, rewarding and just plain fun to develop something from scratch, even when there are better things that already exist.

This is true; but after enough years in the industry you learn to correlate success with laziness. This is well-discussed and arguably obvious but on an emotional level it takes a long time to fully sink in. We were all once developers with outsized ambitions and awareness we can flee to greener pastures.