Personallly, I don't know how anyone doing any serious work can be satisfied with the screen size of laptops today.

I do use a 2011 17" MacBook Pro and that is just about adequate for most of what I do but obviously no match for the mini with 27" monitor.

As for those 12" and 13" laptops - maybe useful for shopping lists if you have good eyesight or use the access faciities, beyond that they'd just drive me to distraction.

Indeed, I'm totally sick of the endless drive towards tinier and tinier whether on computer gear, audio gear or labelling. Do no manufacturers care or take account of the reality that as people age their eye-sight diminishes? It would seem not.