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>>Adding items is not required
>And WHO made the STUDY to really tell if it's required or not???
Is a study really necessary? You seem to ignore certain points when you feel your position is being countered.
One point you completely blew by was, as stated in the post to which you wrote this reply, if the app isn't broken, the user wouldn't need to add menu items. In other words, if the app being installed includes a properly formated "app.desktop" file, as per FreeDesktop standards, the app would appear in the correct place in the menu. The user could then use GNOME's included menu editor to remove it if he/she so desired.
If, on the other hand, the app is broken(read:no "app.desktop" file), there are other ways to handle it aside from menu editing at the user level. Such as adding a launcher on the panel or desktop or actually writing the app.desktop file and dropping it in to the correct directory(generally /usr/share/applications).
IMO, handling menu editing at the user level is wrong. It should be handled at the system level with an option for the user remove items from their menus if they see fit. As it stands now, that's what we have. Provided, of course, that the app developers follow the standards laid out by FreeDesktop.