question pertaining to modenc vs Deezire

[Nikademis Von Hisson]

Quote from modenc

The infamous -G suffix has no meaning whatsoever.

But in Deezire's AI Tut it says

NOTE: the use of '-G' as a suffix to the numbers throughout this file indicates that this is a 'global' value, meaning it will be used throughout the game regardless of any other conditions placed upon its use.

Does the '-G' have to be used or not?