That's silly that low power chips are available only for "entry" level MacBooks. The main decision-maker for me is not CPU but the size of the screen (I cannot go lower than 15''), therefore I'm kind of stack with rMBP 15.
I checked Geekbench for fun and found that a new "low power" Intel i7-1065g7 works twice faster than the old "high power" Intel i7-3720QM from my first rMBP (mid 2012). I still use that laptop and found its performance good enough for my needs, therefore I more than sure I won't experience performance loss with the new low power CPU.
As for blender, how many people actually need to run blender all day? Would not be better to buy a desktop for these needs? I have no doubts there are people with needs for "mobile power" but I don't think there are too many to enforce everyone to buy the top CPU.
Overall, I think, I know what I want, I want 16'' MacBook Air.
ok, but Apple isn’t likely to do that. At least not any time real soon. And I definitely disagree that high performance chips are somehow wasted in laptops. You don’t need to run something all day like in my exaggerated example to make them worth while. Remember, we are only talking about a few hundred dollars of difference on a machine that might last for 4 years. It doesn’t take a lot time saved on work to make that worth while.