I think there are a lot of factors, I will go through them one by one
1. Computer age. I learned to type (on an old Commodore 64) at home right at the time I was learning the alphabet, and long before I learned cursive, and during middle school and high school, every bit of writing was typed. I also do not type te standard way at all. I developed my on style long before any keyboarding class (first one in 7th grade) and am just as fast with one hand as with two on the keyboard.
2. I was never taught really how to write properly, only how the letters should look. nothing about proper grip or posture, and always with small diameter bic sticks and pencils that I had a hard time gripping. My hands would get wore out very quickly due to the tight grip required. this was remedied bu middle school with larger diameter mechanical pencils, but never with pens until recently when I bought my first FP, which is a laege diameter pen. I got lots of criticism for terrible cursive, and printing was not allowed during 3rd and 4th grade, but nothing on what I was doing wrong. after 2 years of cursive, nothing has changed. my mother lived a few hours away, an my dad does not write cursive, so no help at home.
3. during the time I learned and had to use cursive, there was too much emphasis on speed, and writing had to be on the paper fairly quickly. speed is the quickest way to make a mess out of anything.
4. what difference does it really make if it is printed or in cursive? what matters is if it can be read.
Forcing left handers to write right handed, paddling for minor mistake or ink blot (with a dip pen, no less), in my book, that is just sadistic.