Dynamically types languages are just plane unsuitable for the type of large project where you need to break your end to tests down into unit tests. If you have a trivial program (under 100,000 lines of code or so), your end to end tests won't take that long to run if you take care, you will never be able to maintain that much in a dynamic language just because change becomes so hard without static types.
That's not really true, change is incredibly _easy_ without static types. I've worked an a few large projects now all in Python or JS where the test time has never really been an issue, nor has the ability to make changes.
I'd say it's not really the language, but rather the abuse of it. The same goes for any project in any programming language.
