Was it really idiomatic ruby that "stopped you from being unable to understand behaviors"? Or was it unorganized monkey patching? I'm having a hard time thinki

Was it really idiomatic ruby that "stopped you from being unable to understand behaviors"? Or was it unorganized monkey patching? I'm having a hard time thinking that ruby is difficult to understand, particularly compared to its opposites lisp, erlang, Haskell, e.g. languages that are extremely simple to the point where the burden of complexity is shoved into code space.