Yes, big time.
Apple were also the only OEM who actually stood by their customers offering repairs to 'fix' affected machines. Of course since all those Nvidia parts were faulty, all they could do was to replace the motherboards but those would eventually fail too. Heard that some people had their Macbook Pro's logic board replaced 2-3 times.
Anyway, Polaris 11 is meant to have been made on extra thin wafers and as soon as that news came out it pointed to the fruity company so crazy for extra thinness even their computers might soon bend when used...
Also, gaining under DX11 or even DX12 is hardly what Apple cares about: OpenCL and Metal performance is. And there is no guarantee that GP107 downclocked to 35W would offer there same performance.