Even ipad handwriting recognition has weak points. For example, a q by itself will almost always turn into a 9. I wonder if PDAs had it right after all and we need to adapt our characters to make them more easily understood by machines.
My experience with every hand-writing recognition facility since has been it has got worse, more opinionated, and is probably tied too tightly to grammar and spell checking - rather like what I call "destructive texting" when predictive typing on mobile devices constantly auto-replaces words after I've typed them without me noticing until a message is sent!
[0] I still have it although not powered up in a couple of years!