There was a brilliant Twitter thread last year showing a project to "hand write" with cnc robots thousands of personalised letters for a mailout. They initially started off with off the shelf hand writing robots, but ended up building their own massive ones to increase speed and efficiency. https://mobile.twitter.com/aarondfrancis/status/143888821947...
It really makes a difference to have hand written with a pen as long as you have a font with multiple letter variants/subtly differences between the same letter used repeatedly.