Every time people talk about static types and the lack of them in Elixir I chime in to repeat that it is a misconception to think of typing as a black and white issue.

Typing systems exist on a spectrum: I constantly get type issues on Javascript and Python, refactoring is a nightmare without a ton of tests, while it was never a big issue in Elixir. Yes, its typing system is inadequate, and dialyzer isn't great, but in practice it is not that much of a problem. Pattern matching saves the day, and type errors found in rarely used code paths, what's the worst they can do? Crash the process? That's the least of our problems on the BEAM.

I've maintained a big data ingestion system that kept getting fed with bad, unforeseen data and it's never gone offline in the 3 years I've overseen its operation. If a bug causes your program to segfault or throw a NullPointerException, you will definitely want to have a strong typing system.