they are logically equivalent (of course) and the parentheses become invisible once you are used to them. Every language has a threshold of "fluency" which, onc

they are logically equivalent (of course) and the parentheses become invisible once you are used to them. Every language has a threshold of "fluency" which, once you reach it, makes it easy to understand at a glance. Retooling to use nesting boxes has obvious appeal to a newcomer, but none to an existing programmer, and the cost to the corpus of existing programmers is far too large to justify.