…tion with the title but there’s nothing in here that’s convincing anyone to go look into smalltalk. The 5x productivity boost is a meaningless claim. 5 times more productive than what, writing C?
However, I realize that many people don’t trust anecdotal evidence, so here is a statistical study that bolsters the claim: https://www.ifpug.org/wp-content/uploads/2017/04/IYSM.-Thirty-years-of-IFPUG.-Software-Economics-and-Function-Point-Metrics-Capers-Jones.pdf. Apparently, Smalltalk is, on average, twice as productive as the abovementioned languages.