>> There are advantages to not using types, such as a faster development speed > In my experience, not even that. Static typing speeds up my day to day program

>> There are advantages to not using types, such as a faster development speed > In my experience, not even that. Static typing speeds up my day to day programming. Completely agreed. It also completely blows past the whole maintainability argument -- the junior developer you hire in 6 months is going to be much slower getting up to speed on your untyped code (using the "royal you" here). For some, I'm willing to grant that it may be "faster" to write initially, but every developer reading your code written without types thereafter is going to be slower.