Cold boot is not really that important in itself, but it's a good measure of how much needless cruft is being loaded on your system. If it boots almost instantl

Cold boot is not really that important in itself, but it's a good measure of how much needless cruft is being loaded on your system. If it boots almost instantly, you can be certain you don't have a million unneeded processes draining your battery life. If it spends 30 seconds before you get to the login screen on good hardware, there's no telling how much things are going on and how it will affect your battery life. A fast boot process is also telling about good engineering in general, as it implies more things are decoupled and can be loaded independently, instead of being queued in a one-by-one sequence. So in itself, a fast boot is not that important, but when they manage to cut it in two compared to what I'm used to, that gives me confidence they are doing the right things in general.