What is more secure about X11/XLibre? At least the half of the list from your link is not even true or even something X11 is also affected. And I am using Wayland, because X11 just crashes a very important application (that one I am mainly working with) within 30 seconds after start. There are good reasons to use Wayland right now. And of course Wayland has issues and I am also affected by some edge cases X11 does not have.
An 1h answer to your source: https://inv.nadeko.net/watch?v=nWnBg8zGAeU.