MS has front facing speakers in the Surface tablets, so maybe there's hope future phones from MS will have this. Or maybe not. We know it was not an arbitrary cost-cutting decision. One possible factor is the battery run-down tests that are so common in review sites. These sites usually include some type of looping video, but they do not standardize volume output across phones (eg. played so-and-so video at an average output of X decibels), so if the review site just set the volume to the phone's "medium" setting, which in Windows Phone would be volume 5 out of 10, it's to the manufacturer's advantage battery-wise to make the output relative low, making the battery last longer. It's interesting that many review sites have noted the 640/XL for its good battery life, but rarely if ever mention the relatively low speaker output. Just a theory
WW