It's disappointing that they released news about upgrading the JP data centers first, but they could easily share new news about planned NA/EU server improvements soon (wink wink SE).

JP servers work better because they were used from alpha through launch. NA/EU servers were only used for beta phase 3 through launch and haven't been tested as rigorously. As a result, the NA/EU servers are broken because they aren't set up the same. Adding new servers might not "fix the problem". SE needs to fix the current NA/EU server problems before they add new NA/EU servers. For example, pretend there is a car released with manufacturing defects. It would be pointless for the manufacturer to continue making the defected car until the defects are fixed.