Nativefier has been archived at the source since a year. All nativefier apps should be removed for safety concerns at this point.
Steam native has been deprecated. Building the dependencies for this is a big pain, so it may be part of why you thought the update was so large. If you are not actively going out of your way to use it for an antique game which doesn’t work with runtime, it should also be removed:
This GTK2 theme is long discontinued and gone from repos, removing it may finally let you get rid of gtk2.
These are probably lingering without a good reason.
Chaotic-AUR dropped Motrix for failing to maintain their Electron version and leaving it to rot. At this point, it has been unmaintained for a couple of years. Consider moving to chaotic-aur/varia or another app instead:
Please do check and merge the many pacnew/pacsave files.
You can use meld for convenience:
sudo -H DIFFPROG=meld pacdiff