But precisely nothing you mention makes a real substantial difference to the exterior of a machine. That's why I'm saying that any external redesign would be change for change's sake.
And yeah I hope they finally kill the non-retina Macbook, if for no other reason that it's artificially inflating resale values for a host of machines.
All these are changes that mostly affect physical thickness - which isn't an big redesign - but it's lots of cumulative, iterative design changes that sum up to a lot of change.
* Helping make the MacBook thinner/reduce volume: Changing the keyboard keys, retina display thinner, USB-C port, speaker move, reduced logic board, fanless, terraced battery
* Reducing battery size/improving battery life: LED backlighting 30% better energy efficiency, lower power CPU, integrated GPU...
* USB-C port - Smaller port, goodbye having so many ports. Goodbye USB-A ports , DP, ethernet.
Can they really make "real substantial" changes? They did with the physical height, the speakers, ports on the MacBook.
What would be big substantial exterior machine changes?
- Material change ala carbon fibre Dell XPS? Apple's used different alloys to reduce the weight/increase strength of the aluminium used, but not strayed from aluminium much.
- Thinner bezel ala Dell XPS? The exclusivity deal may have elapsed, if they wanted Sharp smaller bezel screens.
- Radically changed port layout - type and quantity. Isn't this a big one?
- Keyboard & speaker changes ala MacBook - that the MBPs get the speakers at top?
Has Apple done many external redesigns just for the sake of change?