I completely disagree. Retina is wonderful, but it's not like we were looking at monochrome 512 x 342 pixel displays on our iOS devices before retina came about.
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No its even worse than that. Retina means a pixel doubling in height and length. So four times as many pixels as before. Compared to the Macintosh 128K with its 512 x 342 resolution, that means a 1024 x 684 display.
Macintosh 128K 9-inch 512 x 342
Macintosh 512K 9-inch 512 x 342
Macintosh Plus 9-inch 512 x 342
Macintosh SE/SE 9-inch 1 bit 512 x 342
Macintosh SE/30 9-inch 1 bit 512 x 342
Macintosh XL 12-inch 720 x 360 (B and W)
Macintosh Classic 9-inch 1 bit 512 x 342
Macintosh Classic II 9-inch 1 bit 512 x 342
Macintosh Color Classic 10-inch RGB 512 x 384
Macintosh TV 14-inch RGB built-in 640 x 480
Macintosh LC 550 14-inch RGB 640 x 480
For about a decade there was no progress in resolution at all. Let alone a doubling in resolution. You needed to wait 14 years for the first iMac to arrive to get four times as many pixels.
iMac 640x480 @ 117Hz, 800x600 @ 95Hz, 1024x768 @ 75Hz
iMac DV 640x480 @ 117Hz, 800x600 @ 95Hz, 1024x768 @ 75Hz
iMac (5 Flavors) 640x480 @ 117Hz, 800x600 @ 95Hz, 1024x768 @ 75Hz
iMac (Early 2001) 640x480 @ 117Hz, 800x600 @ 95Hz, 1024x768 @ 75Hz
iMac (Summer 2001) 640x480 @ 117Hz, 800x600 @ 95Hz, 1024x768 @ 75Hz
iMac (Flat Panel) 15-inch 1024 x 768
iMac (17-inch Flat Panel) 17-inch 1440 x 900
iMac (15-inch Early 2003) 15-inch 1024x768
iMac (17-inch Flat Panel, 1GHz) 17-inch 1440 x 900
iMac (15-inch USB 2.0) 15-inch 1024x768
iMac (17-inch USB 2.0) 17-inch 1440 x 900
iMac (20-inch USB 2.0) 20-inch 1680 x 1050
iMac G5 (17-inch) 17-inch 1440 x 900
iMac G5 (20-inch) 20-inch 1680 x 1050
iMac G5 (17-inch Ambient Light Sensor) 17-inch 1440 x 900
iMac G5 (20-inch Ambient Light Sensor) 20-inch 1680 x 1050
iMac G5 (17-inch iSight) 17-inch 1440 x 900
iMac G5 (20-inch iSight) 20-inch 1680 x 1050
...
And so it goes on and on with only minimal progress if any. Only todays 27-inch iMacs with 2560 x 1440 resolution have again quadrupled the pixel count of the very first iMac. Going Retina means quadrupling from one generation to its immediate successor. Its an unheard of leap in display resolution.
You could pretty much ignore the few hundred more pixels in previous screen updates. This time its about megapixels. In the past a higher resolution always meant more screen real estate but tinier text and buttons. So what you saw wasn't even sharper, it was just more of it. This time its different.
Retina is a day and night difference. You don't wanna be the poor bastard who bought the last non-retina iMac.