> It came out Twitter doesn't have a dev/staging environment. And? Dev/staging is fine for enterprises that don't have to operate at Internet scale, think havi

> It came out Twitter doesn't have a dev/staging environment. And? Dev/staging is fine for enterprises that don't have to operate at Internet scale, think having a build script means they have CI/CD, and are doing waterfall development even if they call it agile. For truly Internet-scale services the cost/benefit of trying to build a staging environment that would have any usefulness doesn't pencil out. Canary deploys with well thought-out rollback plans works fine.