We're talking about Ultrabooks here. Which is a "new" form factor with, probably, weird hardware to get the size/weight down. You can't install OS X on a Thinkpad, either, the hardware wasn't meant for it. So yes, as long as OEMs don't provide Linux drivers, you won't be able to install Linux on any random device without worrying about hardware issues (and I'm not trying to say that they should provide Linux drivers, no value judgement going on here).
However, if you use hardware that is fully supported, the Linux experience is trouble-free. Just like the OS X experience is trouble-free if you use a fully supported device (a Mac).
However, if you use hardware that is fully supported, the Linux experience is trouble-free. Just like the OS X experience is trouble-free if you use a fully supported device (a Mac).