If Apple makes a thinner laptop with similar thermal envelope ad heat/noise levels (like they did with MBP vs rMBP), that means that they were able to design the same thermal efficiency into a thinner chassis, based on newer CPU/GPU, etc.
I like the new 3.5-4.5W fanless chips. Family member has a thin, light system with one. It is great. Can do 2D graphics/video and the CPU is as fast as a 2008-ish unibody MBP-- plenty fast enough for an OS, a word processor, spreadsheet, presentation. Except the one I'm familiar with runs Windows. :-( I have no quarrel with thin, light, silent notebook computers. And, I don't mind paying a couple hundred bucks extra "Apple Tax" to get OS X instead of Windows.
But ...
That also means that if they were to keep the thicker design, they would've had more room for the cooling design, and therefore ability to make it quieter/cooler.
I also would like to see a real MBP mobile workstation, thicker, with plenty of cooling, a real keyboard, not a chiclet keyboard, a 3840x2160 display, a Xeon E3-1545M v5 mobile workstation CPU with a Polaris version of W7170M (AMD RX490M GPU is the new Polaris consumer version out soon) In other words, given the 35W-45W CPU and 50W+ GPU power budgets of yesteryear, e.g. high-end 2008 unibody, updated to today's performance and capabilities.
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