Good point, I think the reason it helped me was I could trust what I had written down a lot more as following a clean line of thought I had become reasonably certain of - which had the effect of speeding me up because i wasn’t looking back in some chicken scratch sprawl and trying to find whatever weird assumption I had made somewhere. It still would happen in pen sometimes, but, a lot less, and if it did, the error was much more blatant and easier to find.