You are right, it is mostly about the slowing down. Switching to the unfamiliar block lettering forces you to go slow. It's a trick, so that you do not have to

You are right, it is mostly about the slowing down. Switching to the unfamiliar block lettering forces you to go slow. It's a trick, so that you do not have to be deliberate about writing speed but about lettering. In my experience the latter is easier than the former, but obviously YMMV. I don't know if uppercase hurts comprehension. I think, I have no problems whatsoever. But block letters are not all upper case anyway. You make them of different size to signal upper and lower case, i.e. https://en.wikipedia.org/wiki/Block_letters https://en.wikipedia.org/wiki/Block_letters