Alright, that makes a lot more sense. Also I installed it this morning and I'm a pretty big fan. I really like the idea to have a hotkey to show the main hotkey commands. It's such a little quality of life thing that I think greatly lowers the learning curve of i3.
On some of the most popular GPUs (intel) you get reliable VSync without compositor because synchronization logic has been removed from the chip. And while some tolerate tearing, many don't