I’m lazy and allways clean “/var/cache/pacman/pkg/” after system updates.
I do backups every night with backintime plus clonezilla every x weeks.
I do this since starting with Manjaro stable branch in year 2017(?).
Never had any troubles!
What trouble can you think of i could face doing like this?
Stable branch has the installed/updated packages until next “official updates”!
Curious about your answers …
Just for the record, you don’t have to do that manually. Just look at… 
man paccache
I also clean out the whole cache after updating, via…
sudo paccache -rvk0
I also keep backups, via timeshift.
If you empty the cache, then you won’t be able to downgrade in the event of a botched update, but I prefer not to downgrade anything anyway, and should that ever be needed nevertheless ─ which I don’t expect to ever be the case, but never say never ─ then I can just as easily restore a backup.
Just my two Eurocents. Your mileage may vary, and all that. 
Also, there’s a systemd timer that uses pamac to clean cache, pamac-cleancache.
systemctl list-timers
Not using Manjaro as long as @JohnML, but when pamac was upgraded to 10 and there were problems, I was able to easily downgrade to 9. Like anything else, it’s belts-and-suspenders. The cost (disk space, time) is weighed against the “what-if’s”, and varies per user.
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