What? Have you ever graded written papers? Have you ever seen a paper graded by a good teacher?

We’re not talking about pages of written commentary here. The most “effective and efficient” approach involves circling words or phrases, underlining sentences, writing arrows from one part to another, scribbling some wavy lines in the margin, writing a few words here or there, ...

There is a very limited amount of time available to work through each student’s work. The point is not to entirely rewrite the paper for the student, or explain every problem with the paper in detail. The point is to highlight what the student did well, highlight the parts that make no sense, and give the student a few pieces of quick feedback so they can revise their paper or do a better job next time.

A colored pen on a black-on-white printed copy is much more “effective and efficient” (and “fantastically less work”) than electronic tools prominently involving a keyboard.

"Effective and efficient"? Or just lazy but fast?

Achieving the goal with less effort so that you can spend more effort on other aspects of the job or on other endeavors is effecient.

Wanting each of your teachers to learn how to use a constantly changing array of 20 different social image sharing services in order to receive work in a format that is more work to process is lazy.

the former. Even some professional editors prefer pen/stylus for some review stages.

You can do this with a pdf with annotations and a touch screen with a pen