It’s not bad advice but I’d do it for latency for western clients more than this — I’ve been running in us-east-1 since the 2000s and there’ve been only a handful of times where we had a production outage on a properly-designed application (a network routing issue in 2011 or 2012, and a couple regional S3 or IAM issues). No, those weren’t perfect but during the same time period our professionally-managed data center resources had multiple weeks of complete downtime versus maybe a day cumulatively.