I actually prefer QHD screen since it looks great with 2x scaling (and I don't really care about text mode which is only useful for recovery). I have no problems with HiDPI or touchpad after upgrading from the ancient 16.04 LTS that comes preinstalled. I hope that the next edition would come with 18.04 LTS which should offer a much better user experience out of the box.
I've tried the alpha on a Acer Surface-esque tablet with a HiDPI screen and agree 18.04 is much, much better out of the box - scaling was set sensibly and usably on first boot. Very much looking forward to the release.
