Note the "HWE" (hardware enablement) on that chart. Ubuntu 14.04 came with 3.13; if you want a 4.4 kernel, you have to install linux-generic-lts-xenial.
I might still switch to Arch Linux. It's been a hassle to get the latest releases of various packages (like python, gcc, etc). I've had to use third-party PPAs or manually install them. Ubuntu's freezing of packages makes it great as a base image for Docker containers and other reliably reproducible deployment scenarios, but that's not so great as a regular desktop user.
Chris from LAS does say I believe in User Error 6 or 7 that if you don't update Arch in a while you could have stability issues when you update.