Even though restoring the packages back to a certain date may resolve your current issues, it is not a solution to them in the long run.
Sooner or later you will have to do a sudo pacman -Syu because of the nature of the beast that Arch Linux is.
You may then be facing the same or other issues that need to be handled.
A much better strategy, in my opinion, would be to try to troubleshoot what might be wrong and fix that rather than using a snapshot or roll back all the packages to a certain date.
At any rate, it is "Your System, Your Rules.
There are those who reinstall their system when they encounter some issues they believe to be unresolvable.