Probably not significantly less secure than Xorg itself, I wouldn’t mind using in your place. DE security is usually not a huge problem, if someone can exploit these vulnerabilities usually you are quite bonked.
Remember most of what happens on screen is xorg, the wm is a simply interacting with xorg and other parts of your DE are simple user level programs like the panel etc…
Statcounter considers me a Win user due to the Win user agent I’m using, this is not a rare behavior in the Linux space…