The players will then be torn from the fantastic quest they are embarking on so that they can laugh at a stupidly designed monster. The designers will inevitably get lazy and just throw something together in order to meet a deadline.
It's hard for even the Final Fantasy series to keep up a consistently great range of monsters, especially when a game might feature over a hundred creatures. This was helped by incredible artists, like Yoshitaka Amano, who created awesome designs for the monsters. One of the most impressive ways they have done this is with the monsters that the player battles throughout the game.
The Final Fantasyseries has always pushed the boundaries when it comes to graphics.