I understand the points you are making, but even comparing the non-retina 15 and 17” models have no bearing on what a present day 17” mode would offer. You really can’t use that as a present day argument of the two sizes.The "relevance" was that it was argued the 17" had no benefits over the 15" available at the same time. This was then twisted to somehow compare the pre-retina 17" to the retina 15", to justify a position of 'the 17" had no advantages'
Odds are there would be little to no difference on a current day model between a 15” and a 17” designed MacBooks Pro other than size.
Of course all of that is speculation, and we could be proven wildly wrong by Apple, but when was the last time Apple proved everyone wrong on the ideas of what Apple was working on behind the curtain? I’m thinking it’s been a bit.
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I really hope they don't go to a round cornered panel on a MacBook Pro design. Should it would look cool, but that is rather impractical in my eyes. I like nice square edges on my monitors.If we are talking about feasible future MacBooks, I could potentially see them splitting the difference with a custom 16 inch rounded-corner panel if they follow iPhone/ iPad aesthetics for the next redesign. Basically with that you'd get native @2x 1680x1050 resolution (3360x2100 physical pixels) and 1920x1200 might be a little bit more comfortable to use as a scaled resolution. Such a machine would have virtually the same footprint as the current 15".