Yes, such tools exist, and they are really hard to use usually. It's hard to copy, hard to refactor, hard to compose, etc., and clicking by mouse is really slow

Yes, such tools exist, and they are really hard to use usually. It's hard to copy, hard to refactor, hard to compose, etc., and clicking by mouse is really slow. I don't say that a good UX couldn't exist for such thing, but we already have that good UX in a form of text. Really. Think of it.