What is interesting is that Rich made so many systems in C++ and one in C# and after 18 years came to the conclusion that types don't help at all and that the examples of where they help are contrived.
Back when I started OO was the big new thing over procedural. It is still the orthodoxy. Yet more and more people are coming to the the conclusion that class hierarchy polymorphism only helps in very narrow places and hurts maintainability. I worked on several large Java systems with dozens of developers and now agree that classes are over used and abused on the typical business apps I worked on. The last large scale multiple dev team system I worked on was written in Scala and found that algebraic types, pattern matching, lexical scoping and functional programming was much better for maintainability.
The talk by Rich suggests to me that I should be more open minded about types in general being over-applied much like I have come to appreciate classes were over-applied.
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