MAC OS 10.12 SIERRA!!
do you hate the usefulness of karabiner, FCP7 log and capture, and LibreOffice?
do you want apple to automagically sync your desktop and document folders across all your devices using some logic and process you can't pause, stop or otherwise control?
would you like to talk to your computer and have it respond with the same crippling lack of usefulness as your phone?
are you stymied by the fact that when you copy some bit of useless text on your phone and then wait upwards of 30 seconds, that same text isn't automagically propagated to the clipboard of your laptop?
are you hard at the thought of a built in utility half as capable of dozens of crapware "spring cleaning" type apps that do advanced things such as empty your trash for you on a predetermined schedule?
would you like to see the finder crash with a cool new dialog box that actually asks you if you want it to crash or to keep messing up without crashing?
do you love the bugs that make disk utility a piece of crap where it was formerly just fine? would you like mail.app to start crashing again?
are you nostalgic for the bug that made Ghostery bork the combined Safari search/url box in the early days of 10.11?
THEN UPGRADE NOW!