Our entire infra in GCP stayed up just fine, we just couldn't manage anything. IDK what to tell you. Many of the things you list here were not down at all.
If some of those things listed had actual widespread outages, it would have been much much worse.
As a former SRE there, is "widespread outage" a specific, special kind of classification that's not obvious to the public just by looking at the status page...? Or what do you mean?