If this were to hypothetically take place in an Avengers movie then yeah... it absolutely 100% would be in NY. Everything BIG happens in NY. But if hypothetically this were to take place in a BP movie, then they MIGHT wanna avoid NY just so it doesn't turn into an Avengers movie. Oakland would make it a Wakandan problem in addition an obvious US one, and possibly make it personal for him if someone he cares about like Shuri is there. If anything that major happens in NY, you start wondering where all the other super heroes are.