ML languages aren't really OOP similarly neither is Rust really. There's a beautiful middle ground between piles of functions and types with purpose that doesn't suffer from the swamp nor the over abstracted mess that a lot of paradigms offer. Okay I'll get off my high horse but I recommend trying one of these paradigms someday if you haven't already. Traits are wonderful.
I can't explain the downvotes other than that in OO method chaining does not bind you to a specific type. I don't really know Python but in Ruby, for example, you can do `"string".split.map { |s| s.upcase }`. IE, a method doesn't have to return a reference to `self`, so I'm not really seeing your argument other than choosing to use the style of only chaining when the object types match, which you can still do with pipes if you want.
The only ML language I have any experience with is OCaml which is statically typed and has pipes.
EDIT: re-reading your last comment it looks like I totally ignored the first part of what you said, but I guess I'm confused. This thread is also probably nested enough, lol.
