Oh I'm not suggesting that it will never peak higher than what Apple offers; again, I do agree that it would be nice if the Pro line offered a little more to users looking for more oomph.
It's just that, again, by and large with everything with the Mac line up right now, you throw something at it and you're good to go. Even my 2012' Air can do moderately advanced video editing in Premiere, the only real bottlenecks being local storage and the CPU taking a bit to render video.
The current line up is not a perfect solution for absolutely everything, and Apple's power option in the Mac Pro line is just unacceptable for most people, even if it does bring a lot to the table. But in most cases, Apple's line ups do extremely well for a large majority of things you'd want to use a computer for. I too would enjoy a quad core in the Air/Pro line, or at least the Pro line, though I suspect the issue is heat, and as I said earlier, I'd happily take a bit of thickness to accommodate a heftier processor.
I certainly don't endorse letting Apple tell me what hardware I need; I also don't have too many complaints with what they've given. Price exaggerations aside, I find the price tag for the Macbook Air/Pro lines appropriate for the base models, and comparable to other 13" sized machines with similar specs and amenities (for lack of a better word). Such is sort of the nature with Apple and being a long time user - there's a lot Apple does that bugs you, but at the same time, there is a lot of good you get with the hardware and the OS.