Different priorities.
I teach Math with mine, using OneNote as a whiteboard replacement. I've also seen about 6/160 students in my classes this semester using them to take notes. Many more (about 40/160) were using iPads though.
Can you quickly change the color of your notes to whatever you want? Nope, you'd have to carry each color pen separately.
Can you carry all the notes for each of your 5 classes in something that easily fits in the hand?
There are a billion reasons. Honestly, it boggles my mind why anyone would prefer to take notes on paper.
And no, I’m sure my students would not like me writing faster.
Morever, digital notes sync. A note taken in tablet can be viewed in laptop or desktop or phone whenever the opportunity presented itself.
I'm genuinely curious about what you find cumbersome.
Granted I've never been furiously writing dozens of pages of notes to begin with (to me the most important thing you do is listen to the meeting/lecture/event, notes are bookmarks and comments). I've used an iPad Pro and then the Surface Pro for meeting notes for about 5 years now, and it's just an infinitely paging/scrolling canvas, nothing more nothing less.