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…

These days it’s mainly snap and how you can type apt install and the system will do snap install instead, for firefox for example.