Apple's hardware design is much less distracting for mockup presentations and given the OS, the type is more legible (see below). As a designer, I don't want my work pasted onto a ThinkPad with all of the blinky lights, colored buttons and aged edges taking away from the intent.
*This is not to excuse designers who don't test their typography under ClearType, but rather if there's a way to make my work look better naturally, I'm going to use it.
Do you have some sort of basis for claiming it's less distracting? I mean, I get that it has a certain visual appeal, and I readily accept your font claim, knowing little about font rendering.
But I'm not at all convinced that an Apple laptop is less distracting than a Lenovo laptop. After all, we're discussing it in the comments, aren't we?
We're discussing it because people would rather believe that it has something to do with elitism rather than sheer simplicity. Google image search shows that most Lenovos suffer the same fate with the edges, unless you're talking about the IdeaPad, whose screen is flush, but the juxtaposition between a white keyboard body and a black screen would be too harsh for me to use it in a shot.
*This is not to excuse designers who don't test their typography under ClearType, but rather if there's a way to make my work look better naturally, I'm going to use it.