the vast majority of mathematical equations/terms would become completely unreadable if you replaced single symbols with descriptive terms. You are going to have to internalize what the symbols refer to anyways to understand the formula, and once that is accomplished any additional description is a waste of space and cognitive bandwidth.
We did try it. We tried it for a couple of millenia. It was much harder to understand and our collective mathematical output as a human species was much slower than it is now.
You know when you go to a foreign country, ask for a particular thing in a restaurant proudly in their language that you picked up on Duolingo the week before and the waiter starts talking to you quickly in their language and you lose it completely.
We are just that waiter. You didn't learn the language or get the prerequisite skills. So do that or don't bother. It's not easy and there are no shortcuts.
Even if i agreed with you that full words/phrases were easier to parse, any gains made here are easily offset by how much harder and laborious it is to manipulate them on paper
