The thing to remember about Google and software is that consumers don't see the vast majority of the software it produces and uses, from the distributed filesystem colossus (https://cloud.google.com/blog/products/storage-data-transfer...) to an enormous number of other internal projects just as complicated as that.

It's user-facing stuff may or may not be great--and the consumer level flops are legendary--but that is only the tip of the software iceberg.