I haven't yet attempted a masters degree, and I'm not sure if I will. I did get accepted into one a few years back - its focus was on digital technology. Sounded interesting, but I just didn't get around to starting it.
I get how you feel about middle school STEM. I teach Year 7 Maths, and find, at times, that it can be particularly trying and energy sapping. I'd never really thought a great deal about the why - I always just chalked it up to "that's the nature of Year 7's", however, after some of your comments here, I may have opened up a whole new way of thinking about it.
Perhaps master's degrees do have something of worth in them! Thanks for sharing your insights and how you are travelling with it all.
RE: Masters of Teaching Mind Dump #23