I read the first article, which is opinion. I agree with him there is a retention problem.
I Googled teaching jobs in Delaware. There are over 300 teaching positions unfilled. To me that's a shortage.
Why do you think they are unfilled?
You have some valid points mixed in with condescending smugness. Every teacher I know has a masters. Most are not online degrees.
If an engineer makes $90k coming out of college and I'm making $90k in my 24th year, how am I well paid for my time?
This is exactly how you need to think about it.
It's a couple months of pain that gives you your quality of life back. I couldn't walk 10 yards before my replacement. Now I can hike 2 hours. That's all worth it.