I can’t speak to the compression on P+ as I’m in the UK so most new Trek is on Netflix, Amazon or the high seas for me and I haven’t noticed much blocking it artifacts even on a 65 inch screen.
I think I optimal viewing conditions are the biggest issue. People who don’t know how to set up and calibrate their TV or watch on an inappropriate device like a laptop, tablet or phone.
I’m not surprised directors like Lynch and Nolan get annoyed. They put all the works into making the best cinema experience, then people ruin it by leaving motion-clarity on on their TV or watching on a six inch screen with tinny headphones on the way to work.