1.- Make your computer slower and slower every year for no real reason. 2.- Get your files virus infected for not using an antivirus software. 3.- To be fair, get some really cool games.

for the terminal's operating system

Well, I guess, then, You are complaining in the internet about people complaining in the internet about people complaining in the internet... You are the same thing you point out, and the cycle keeps going...

Here is the command that will render a LUKS encrypted device un recoverable
From the documentation.

5.4 How do I securely erase a LUKS container?

For LUKS, if you are in a desperate hurry, overwrite the LUKS header and key-slot area. For LUKS1 and LUKS2, just be generous and overwrite the first 100MB. A single overwrite with zeros should be enough. If you anticipate being in a desperate hurry, prepare the command beforehand. Example with /dev/sde1 as the LUKS partition and default parameters:

head -c 100000000 /dev/zero > /dev/sde1; sync

I think in these days, rm will warn you if you do a
rm -rf /

Ouch!

What does this do? nobody can read any file? would sudo chmod 777 fix it at least to a usable system?

I met a wonderful woman. We are dating now

I can't remember but having my hard drive encrypted, I believe there is a single file that messing with it would render the drive not decryptable.

1.- I will start with the infamous rm-rf /

And maybe even more over time if it continues to "support" them