Like a few others already commented, I also disagree. Was at FB for 7 years, and now almost 2 years at a place with the “industry standard” things like slack / datadog / github / sourcegraph / (20+ other tools all disconnected from the rest and all behind SSO).

As a backend engineer, the dev experience was just incomparably better at FB. Some things I most most are probably phabricator / stacked diffs workflows, buck dep management with everything in a monorepo, deep integration across all the the tooling etc.