zlacker

It is very possible that they did not predict this specific down stream effect, for one of many reasons. I do not want to discount that, though, as I am not at Twitter and am not on a first name basis with anyone there. Maybe there are some who did see this.

What I maintain though is that most anyone still working on code at Twitter, regardless of their experience or overview of the code base, would strongly argue for testing and staging, which appear to go against current leadership's mode of operation, likely because of the time pressure you mentioned.

Not pushing such changes straight to production is a concept I feel anyone working at Twitter would subscribe to, yet has to painfully go against, lest they be led go.