Nah, you can just sudo umount /path/to/device and then remove it. No need to power off the pi.

Out of curiosity what did you install ? And what did you install it on ?

This thread is hilarious. Do what you want, but to rm -rf (assume /) to get rid of unwanted packages is the most Windows thing.

No matter your package manager, I am sure there is a way to get a list of explicitly installed packages and then going through it and uninstalling with the package manager automatically removing it’s dependencies seems like a way faster method.