Nvidia can be a pain - especially when combined with Wayland.
Wayland is getting more and more momentum as display backend on Gnome and Plasma both.
Gnome cannot be tweaked as much as Plasma and therefore Gnome - at least in aspect of theming - can be considered less prone to problems related to theming.
Plasma on the other hand is so configurable - it is possible to get lost in the options - and therefore user applied theming to SDDM and Desktop Look and Feel often cause headaches on updates.
Keeping your personal look and feel customization to an absolute minimum will give you the best options of surviving an update.
Keeping your custom packages (built from AUR) to an absolute minimum with no update check is also a contributing factor tthat increases the survival rate.
Some informative educational topic - at your disposal …