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What do you think of the teaching profession?

I'm not sure what you're getting at, but my mother was a teacher, so tread carefully.

Coarser pixels are "De-optimized." Not "Optimized. Under no circumstances does it make sense to coarsen the resolution. None.

Sure it does. If you're optimizing for file size, reducing resolution is one way to achieve that. From Adobe's Help page on optimizing options:

Downsample Reduces file size by lowering the resolution of images, which involves merging the colors of original pixels into larger pixels.
Note: Masked images and images with a size less than 16-by-16 pixels are not downsampled.

The question is whether some optimization procedures can do that certain parts of a scan while leaving other parts at a higher resolution. I think one explanation for the "layers" in the document was that they were caused by a mask, so maybe that's why the characters aren't downsampled.

I'm not sure what you're getting at, but my mother was a teacher, so tread carefully.

Apples are popular in the Educational system. They are, of course, not exclusive to them.

Sure it does. If you're optimizing for file size, reducing resolution is one way to achieve that.

Complaint from Pilot:- #2 propeller seeping prop fluid.
Reply from Mechanic: -#2 propeller seepage normal.
Subsequent Complaint from Pilot:-#1, #3 and #4 propellers lack normal prop seepage.

Letters "B","A","C" and "K" lack normal Optimization.