Wow, I've now got the urge to look at some javascript in 'ye olde' gothic font, just like the ancients wrote.
Also, I agree with you, Spencerian (or any other ornate script) is not the best for coding notes.
Gregg is very much a "visible" sound system from a time when people just needed to capture the conversations and later expand back into text with the aid of a secretary. That is, if you didn't mutate your shorthand for your own purposes.
That being said, Aaron Hsu's handwriting is beautiful, but not my cup of tea for thinking on paper--my initial reaction to his scanned pages was unpleasant because it wasn't what I was used to from my own hands.
Of course, to each their own... (I love penmanship, and I'm fluent in several scripts, but I do my coding in Emacs, thank you very much!)
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.