Yes @Frog, I know, in fact from How to go back to the previous directory just by double clicking on ubuntu Aravisian explains that
Nautilus is integrated into the Zorin Core Desktop if on Core. Do not uninstall it.
Also,
It is true of many D.E.'s that the file manager manages the Desktop.
I hope there's a way to remove only VLC stuff then, excluding the removal of other packages. The fact here is that terminal tells me they are no longer required but then you guys tell me that using sudo apt autoremove for them can cause problems. I'd be glad to uninstall only VLC and keep modules if you say they must be held for the system stability, despite the terminal saying otherwise. However, by what I read after entering sudo apt remove vlc once I enter Y I'll delete only VLC, because to remove packages that were installed alongside VLC I'd have to enter sudo apt autoremove. So I suppose entering Y will uninstall VLC while holding those packages.
Yeah, I'm not going to ask how to remove preinstalled commands, I know that someday they can come in handy. Other additional or optional commands libraries must be downloaded by the user, right? Because sometimes I entered some random commands and each time I was told if I meant a specific command that isn't installed so I was suggested to install it. It's not a problem, just a curiosity 
. But I won't try no more, just to avoid entering a valid command that devastates my system.