First of all: I always have and always will be a proponent of statically strongly typed languages (although I would argue that "statically strongly" is redundant here, there are only typed and untyped languages, IMO).

But there's one cost that the author seems to miss and that I didn't fully appreciate for some time. That's the cost of composition. If you look at python you can pretty much compose all possible packages on pypi in your project. All their means of abstraction are usually fully compatible (except for concurrency). Composition often only requires a little bit of glue code.

In a statically typed language's ecosystem you will probably a handful of fundamentally different means of abstraction like functors vs. classes that simply don't compose well together. Hence the fragmentation increases massively.