https://medium.com/@dasein42/building-with-versus-building-on-c51aa3034c71

This is an article not specifically about Pharo, rather on the state of the industry
in general and how it got that way, but positing Pharo as a way to learn
building-on rather than building-with, where in the latter case on
every project you start at essentially the same place.

As a result it does put in front of people a fair amount of info on Pharo, and challenges them to try it.

cheers
Andrew Glynn