Not to mention the huge chunks of time it takes to read, correct, and grade written work.
If you gotta teach, much better to choose a discipline that lends itself to multiple choice.
You’d be surprised. I have a BA, a graduate certificate in Professional Writing, and an MA in English, and I found most of my work was graded less on content and more on meeting the guidelines required by the professor or committee. They really just parse the works for keywords or phrases that meet their criteria and go from there.
I spent years editing student papers, and I could go through a 5,000 word essay in less than 10 minutes if I knew what elements were being graded by the rubric. I often didn’t care about the subject matter, just that the criteria were met.