I would always take snapshots of /home. I think it is fairly crazy not to do so.
However, I wouldn’t restore a snapshot of /home along with a / snapshot in most cases because it may overwrite user data.
For me, snapshots of my user data are far more valuable than snapshots of /.
Personally, I would use timeline snapshots for this. There is no relationship between important data in your /home and pacman. What if you don’t install/update any packages for a week? There are probably still important changes in your /home.