Why does AngryBots `QualityManager` alter shader LOD twice?

The developers of AngryBots have altered shader LOD based upon the target hardware by changing Shader.globalMaximumLOD (which makes complete sense). But they have also enumerated through all shaders and applied maximumLOD manually.

According to the documentation Shader.globalMaximumLOD applies globally to all shaders. So why have they chosen to do it this way?

Source from Angry Bots:

 Shader.globalMaximumLOD = quality;
 for (var s : Shader in shaders.shaders) {
     s.maximumLOD = quality;    
 }