Honestly, I don’t have any of those issues you describe/experienced. The recent Linux distro of Ubuntu and Fedora come with a lot of those hardware issues fixed.
Waking from sleep, takes literally 1 second, i.e when I open the laptop screen the login screen of Ubuntu already shows up.
Battery runs for 6h–8h without any issues.
WiFi an issue? Yeah, maybe 2 years ago, but since then, everything just runs.
I’ve tested this now on multiple Xps13 (our go to laptop for devs) and on a brand new Thinkpad T460s.
Monday October 10, 2016