My take on typing and Ruby is that it makes sense in specific parts of the code where you expect to get high benefit from it.
Overall, I don't like using types for the whole project. The reason is that you end up losing some specific Ruby benefits, like being able to express the solution in a few very concise lines of dynamically typed code. Ruby is not designed to be a type friendly language and that shows when trying to use types. It works but it doesn't feel like pure Ruby anymore. It's definitely a compromise. You lose a bit of ruby expressiveness to get some type safety.
I want to emphasise that I am actually very fond of types. For example, I've been learning Rust and I really enjoy using Rust for very different reasons than I enjoy using Ruby.
I think that tools are best used in the way they were intended to be used. And for Ruby that's without types. For Rust it's definitely with types. I enjoy both very much.
In Ruby I'll use types in cases where I would actually prefer to implement the part in another language (like Rust) but using typed Ruby is going to be more maintainable than introducing a whole new language just for one section of the code.