The custom spin downloaded all the packages from the updates repository, loading an ever-so-slightly newer kernel that played nice with that Asus's particular UEFI/Intel Haswell combo.
That computer's working great after doing that, but not everyone can be expected to: A) Troubleshoot why a "should work every time" plain-jane OS image won't even boot--kernel panics in 2014? Who knew, right? B) Figure out how to create a more up-to-date version of that image
UEFI and secure boot and on and on... It's not ~2005-2011 anymore, laptops are a lot more complicated and more diverse than they used to be a very short time ago.