Mathematically it's quite pretty, and it gives you elegant partial application for free (at least if you want to partially apply the first N arguments).
Well, I disagree, you are, effectively, calling entire textbooks and CS sub disciplines merely "pretty", which is again the strawman I am referring to. This is like calling theoretical Turing award level advances mathematically pretty. I hope you see why that is problematic and biased framing.
More plausible is that Haskell designers recognized that Currying is a fundamental phenomenon of the lambda calculus so it needed some kind of primitive syntax for it. I'm not an expert but that is the most reasonable supposition for a rationale to start with. One can then argue if the syntax is good or not, but to do away with currying entirely is changing the premise of recognizing fundamental properties of Turing-complete functional programming language paradigms. It's not about prettiness, it's about the science.
