Because writing a.add(b).divide(c) is miserable

That's a fine approach for "plumbing" type work, you know "join this thing to that thing then call that thing" - and that is most of the code in the world today but it falls apart in math heavy code.

You really just want operators when you're performing tons of operations, it's an absolute wall of text when it's all method calls.

Instead of writing 2+2, you're suggesting writing 2.plus(2) or plus(2,2).