I have some experience with a German shorthand style (DEK) and it is more important to write clearly. Shorthand removes most of the redundant information that is present in regular alphabets and words. With regular writing, a small error somewhere can be error corrected using the surrounding context. When I wasn't being careful, I could often read the text shortly after I wrote it, but after a few hours or days it became illegible to me.

There are multiple levels of shorthand, the faster ones drop more and more information from each word if it can be inferred from the context (for someone familiar with the topic, i.e. yourself mainly).

Shorthand never really stuck for me. Learning to write and read it wasn't that difficult actually, but I couldn't quickly scan shorthand notes like I could with regular writing. I suppose that's a matter of practice and I wasn't ready to sink hundreds of hours into just that. One thing I learned from the experience was how frustrating of an experience it is if you're not good at reading. I have always been an above average reader and I couldn't understand how people struggled so much with it. Reading shorthand was effortful and slow, especially at the very beginning for me and that gave me some perspective of how some of my classmates must have felt.