Did you not learn cursive in grade school? This looks exceptionally readable to me, and other than the capital letters it doesn't really have any flourishes.
And given how practiced his hand looks, I wouldn't be surprised if he was able to write this much quicker in cursive than I could write it in printed letters.
I learned cursive in grade school (xennial represent) but neither I nor my classmates wrote like this. This is some Declaration of Independence shit right here.
I learned cursive too, but it's still much slower to read than plain old 'normal' lettering. I assume the author would be able to read it just fine. It is gorgeous though.
And given how practiced his hand looks, I wouldn't be surprised if he was able to write this much quicker in cursive than I could write it in printed letters.