For the same reason omitting braces in C-style-syntax conditionals and loops is questionable, i.e. misleading indentation. As a bit of an unreformed code golfe

For the same reason omitting braces in C-style-syntax conditionals and loops is questionable, i.e. misleading indentation. As a bit of an unreformed code golfer and a fan of ML-style syntax, I actually kinda like it myself; I was just listing a few things that are "considered questionable" (by some people) and present in both languages.