Having the third zone means you can now run some pretty important services in Singapore, including Cloud Spanner, Cloud SQL, Cloud Bigtable, and Managed Instanc

Having the third zone means you can now run some pretty important services in Singapore, including Cloud Spanner, Cloud SQL, Cloud Bigtable, and Managed Instance Groups. Also, connectivity within APAC is generally not great, you really want to avoid those round-trips to Tokyo or the US if you can. Disclaimer: I work at GCP, but had nothing to do with this particular launch.