Why is the global-metadata necessary?

Unity Engine
1

I am currently working on a mobile game. With our previous games, we have had a lot of hacks due to easily being able to pull out the global-metadata and binary and piece those together to basically get the source code of the game (or at least the ARM instructions).

Why is the global-metadata file necessary? It seems to only benefit the hackers.

2

You can use an obfuscator from asset store wich changes for example the Shoot() method to fla2Df234W() during the il2cpp compilation, hence that will be the name listed on global-metadata file.
It will make the process of hacking the game a little more dificult.