Yeah, at least one outage in the last year for us included the paraphrased "anycast is hard". There's definitely an advantage to limited-blast-radius services, but I wouldn't trade GCS's multiregional buckets for S3 CRR (the same applies to Datastore, etc.). We have strict reliability requirements for global services; our perspective is that some customers want regional control for regulatory reasons, and we're happy to meet those requirements. But composing a global or even multi-regional service on an untrusted, lossy network is "crazy".

Again, Disclosure: I work on Google Cloud (and this network existed when I got here!)