Except that cheats take away from the initial fun and sense of accomplishment that one is meant to get from games. I never use cheats to learn a game, or on the first playthrough. In fact, I only use cheats in games to get things that the developers had stupidly locked away purposely (do they really think I'll attend some event in the future for one pokemon? Or that I don't mind beating a game in 12 hours, skipping all the cutscenes, side quests, running from every battle, and having no fun just to get the most powerful weapon in the game, all for a bit of a strength boost that isn't needed at all? Or that I'll have to send 12 friends a "letter" that they don't want in the game to get some legendary job class that is only helpful at maxed levels?).
At any rate, Glest needs no cheats. This was a topic of discussion before, but no consensus was reached, and besides, the lua console in GAE can give resources, create units, disable the AI, etc, anyway, and Glest's XMLs can be edited to change the stats of units, and finally, the CPU easy in GAE and MG is virtually you cheating, since you have twice the resources as the CPU does.