One clarification, though. All the above carriers have more than 31" seat pitch in Y except KLM. Therefore, the need for premium coach is less glaring for these carriers.

Also, I wonder what your methodology is for stating that E+ fares are revenue neutral when the range of coach fares is so dizzying? If you're saying that E+ is revenue neutral compared to full E+ Y, then, of course.

The fact is, though, that most international premium coach require something approximating a full fare, making it, in essence, J Lite.