That is not something Blizzard really discusses publicly on the forums. Business decisions are made based on what the executives and board think is best for the company. Many countries have fantastic talented individuals who Blizzard does hire. Before the pandemic Blizzard assisted in visa acquisition and the move to a Blizzard work location.
Now that work from home has been the standard for a year we will have to see how much that impacts various company’s recruiting, hiring, and work policies.
I did once ask the former CEO of Blizzard, Mike Morhaime about an East Coast U.S. office for the same reasons. He was happy to talk about the esports expansions and tournaments that would present a bigger Blizzard footprint, but not about infrastructure changes to their campus work locations.
Note: MVPs are other players, not Blizzard staff. MVPs do not speak for Blizzard in any way.