Ruby has had static typing via RBS for a while now, and I don't know if it's because I'm primarily a Rails developer and DHH doesn't like static typing so using these with Rails feels third-class or maybe just that I'm really just all the way in "the ruby way" but it feels antithetical to a dynamically typed language to start shoehorning in static types. Even as a type definition in a separate file it just feels wrong.

Ruby particularly is already strongly typed so there isn't too many suprises with automatic conversions or anything like that. RBS also just makes metaprogramming more annoying - and Ruby's ability to do metaprogramming easily is one of its biggest strengths in my opinion.

If I wanted a statically typed language I would just use a statically typed language.