I totally agree that the sensitivity of the stylus and digitizer is pretty critical. If it sucks it isn't worth it IMHO. As far as needing the dGPU goes, Photoshop can benefit from GPU acceleration for several features such as liquify, smart sharpen, perspective warp, and some of the newer blur filters. When you are trying to apply a perspective warp to a 5 exposure HDR merged RAW file from a full frame 20 megapixel DSLR, you are gonna see some significant lag. I do a lot of HDR imagery as well as a lot of stitched panorama HDRs. Those tend to drag even my desktop PC to its knees when I am applying some of the more complicated filters to them. I also do some video (mostly of the time-lapse sort) and that is also a laptop killer. I believe Premier can also benefit from GPU acceleration for rendering as well. I remember once trying to process some time-lapse videos on my MBA while I was traveling, and it was an overnight process. My poor MBA fired up its fan and chugged on those for numerous hours. Admittedly it is a very expensive machine. But if that stylus is good it will be worth the extra cost over a dGPU macbook pro for me.