It's been suggested 1000 times that DCs should be in physically different locations, but as the Gongcha and other collaborations have shown, SE only really knows about the west coast in NA. Every other part might as well not exist.
We will continue to have all our servers in California because that's where SE wants their HQ to be and it's cheaper to rent racks in 1 data center than in 4 different data centers or in the cloud.

The Cloud DC test where it was east coast was much better for ping than we have currently, but they were quick to tell us this does not mean anything and they are not going to be moving any DCs to other locations any time soon.