Although it would result in greater casualties than before, a frontal breakthrough often yields good results compared to flanking tactics. Absolute superiority in troops can give Russia Nation a greater advantage.
However, on the Westline battlefield, a massive frontal breakthrough is not that easy. First, there are lots of airplanes and airships in the sky. Choosing a frontal breakthrough could likely be detected by the enemy in advance, resulting in a tight defense setup.
The two most practical and effective tactics are somewhat outdated, which makes the problem of which tactics to use on the Westline battlefield for the three front armies a major issue.
After careful consideration, the Allies decided together that the three front armies should each decide their own task deployment, with each army group having enough freedom to choose the direction of breakthrough.