[alkonaut]

> It is less intrusive. Flow's type system is built on annotations which are simply stripped away at runtime

> as opposed to writing in another - albeit similar - language that gets transpiled to JS

How is a nicely typed bit of flow-code different from the equivalent TS? If you make actual use of the type system in either of Flow or TS you should end up with code that looks a lot like Java or C#, with generic types and functions etc.

It's nice that you can do it gradually in flow for an existing codebase, but it's still no difference once properly applied in full.