The whole point of mathematical notation is to ease the cognitive burden by making certain things more automatic via symbol-shuffling: We don't need to think to

The whole point of mathematical notation is to ease the cognitive burden by making certain things more automatic via symbol-shuffling: We don't need to think too hard about solving an algebra problem because we can shuffle symbols around and be assured that the result is valid. I've never seen APL or any other array language used that way, even though it's the only thing that could possibly justify their pathological terseness.