Thanks for the good words about the shoulder book.
Btw
I just dove into a recent Men’s Health article on Long Length Partials, clicked through to the studies they cited, and…no. The research is finding something useful but it is absolutely NOT loading the stretch position. I posted what I found on the Joint-Friendly Fitness channel on YouTube.
I agree that elastic isn’t the optimal resistance, but it’s definitely easier on the joints if that’s the concern.
I’ll agree that (heavy) loading in the stretch position is not a good idea. And my post may have worded that part poorly. But emphasizing the stretch portion of the ROM is crucial IMO. Holding a stretch – say on a bench press – and then contracting out of it has got to be be better on your joints than rebounding out of the bottom. Also something like 1-1/2s or 1-1/3s with a curling movement may be another way… you’re emphasizing the bottom 1/2 or even 1/3 even though the resistance is reduced in the bottom portion of that arc. Also, as far as bands are concerned, John P of X3 may be onto something with his set prescription: Work hard with FROM* reps and then, when you can no longer hit the top in good form, rep-out in the lower 1/2.
[*a relative term. In billdes terms, the SPROM or Safest Portion of the ROM. 
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My new favorite way to train
I don’t frequent the boards as I used to so the 10 –10–10 is foreign to me. Could someone explain the parameters please?
Get your weight quickly and safely into the top position and then lower the weight, taking 10 secs to do so. Immediately go into 10 rhythmic, but fairly strict reps (~1 sec-up and 2-sec neg, may vary with longer arced movements). When you get to the top of the 10th rep, then begin your final 10-sec descent.
So 30-10-30 with a shortened eccentric… That’s it?
Ever tried a different 10-10-10? How about 10 second negative, a 10 second positive, another 10 second negative followed by as many positive/negative reps you can get?
Have Not. Sounds like a good plan!