There are different forms of cursive. The form I learned in the early 90s is different from what my parents learned. Just try and read a Civil War letter. With bad handwriting and breakdown of the paper it can be very difficult.
I understand about reading a Civil War letter. Many years ago I was doing some Civil War research and trying to read some documents which gave me a headache.
I’m guessing the difficult part is not that it all is in cursive writing per se but in the choices of words and phrasings and sentence structures.