I know that varies by region, but schoolchildren are generally taught cursive as a faster way to write. It already requires some memorisation with some glyphs being different from block letters. Why not make an additional step and completely replace it with shorthand, making writing an order of magnitude faster?
Choosing here to reply because I agree with you about the fine motor control, and I also agree with @9tr6gyp3 about being able to read historical documents (roll credits).
One argument I’d bring up in the whole cursive/shorthand debate is whether there are any other languages that have glyph sets that have already been described with Unicode that would be just as fast as shorthand? I’d also want to consider the ease of doing OCR on the documents for digitization. I don’t see how shorthand would be good at either of those things.