As a writer, a lot of times I am writing over 5,000 words in a single article. I can type at around 170 wpm but my wrist starts hurting the moment I write more than three pages in my journal. I also use a split ergonomic keyboard which helps my hands a lot. I also revise my writing heavily which is very hard to do with handwritten stuff.
For readers, it will maybe be a novelty but I don't really see why anyone will prefer reading content that is handwritten since it has a lot of accessibility problems which are solved with proper typesetting.
I could see the value if it was a collection of interesting notes or unique handwriting styles etc. But i don't think its usuable as a blogging platform imo
For wrist fatigue having better paper and pen help a lot, but part of it is just using the muscles and not having a death grip.
This being said I don’t like that this is hand writing with a device. It just isn’t the same as actual physical media.