Well of course if you have the freedom to write a mathematical expression you're going to be able to present it in a way that is clearer than if you have to type monospace characters into a text editor.
I'm not sure it's realistic to expect to be able to type a mathematical expression using ascii more clearly than you can write it by hand (or implement using special unicode characters).
I'm not sure it's realistic to expect to be able to type a mathematical expression using ascii more clearly than you can write it by hand (or implement using special unicode characters).