[westoque]

I believe it depends on the use case. If you notice, Stripe and Coinbase are the first few companies that use the type system. They are both dealing with financial systems and numbers in general where having types would help a lot in catching errors and bugs earlier. I've worked on financial systems before in a dynamic language, JavaScript, and from my experience there would be cases where a number would be passed from a place where it's a string (in a textfield) that then needs to be passed around as an integer at times. Type systems would help catch bugs here or in similar situations.