Well, they did set out to "engineer the impossible", whether they have succeeded in doing that is another question. I think most people buying the laptop probably wouldn't even know about Core M or what it is, they will see an attractive, light laptop that seems to fit their requirements and buy it. So I think that Apple thinks that their customers won't know or care too much about that, so long as it works for them. There is a difference 'between what Apple thinks, and what they think that their customers think.
I would assume any "pro" would know a thing or two about computers and get the machine that's right for the work they need to do, or understand and accept the compromises if they get this machine.
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Where has it been marketed as a "full sized experience" laptop?
And how does one define "full sized experience". I don't take it to mean the MacBook should be able to flawlessly do anything the MacBook Pro does.