The rule is simple to learn and perfectly consistent once you know it, even to a human programmer. This is in direct contrast to mathematical notation, which r

The rule is simple to learn and perfectly consistent once you know it, even to a human programmer. This is in direct contrast to mathematical notation, which remains ambiguous and context-dependent forever. While it's been over a decade since I first learnt this style of functional languages, I don't remember being confused by application syntax. It also helps that function application binds more tightly than anything else. I don't think it's any great indictment that it is not immediately understandable to someone who does not know the rule. There will be lots of other things someone will not be able to understand in a Gluon program, unless they know Gluon. It's perfectly reasonable to expect someone to learn a programming language before they write code in it.