I felt this way as well until very recently. Because Ruby actually commits to the whole "everything is an object" bit in an exceptionally clean way, it does duck typing extremely well -- if you squint, the fact that an object's methods define its type sorta-kinda means that you're working with interfaces (in the Go sense of the term).

Of course RBS makes this more explicit/verbose (in a good way), and ruby-lsp helps bring it all together in the editor.

I feel like I'm missing nothing compared to Python with type hints and pyright. Of course neither compare to an actually typed language at runtime, but at least as far as developer experience, it's pretty alright. I'm relatively new to Ruby but I went from really hating it to being pretty much fine with it for these reasons.