Is It Okay To Create Separate Gsites/Stacks Focused Around Specific Keyword Groups Like EMD As Part Of The Larger Drive Stack?

In episode 319 of our weekly Hump Day Hangouts, one participant asked if it is a good idea to create separate gsites/stacks focused around specific keyword groups like EMD as part of the larger drive stack.
The exact question was:
2) Is it a good idea to create seperate gsites/stacks focused around specific keyword groups like an EMD as part of the larger drive stack?
