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> I'm guessing they know a lot about their costs, and you know very little.

I'm curious what makes you believe the OP doesn't know about cost? They might be director-level at a large tech company with 20+ years experience for all you know...

> There's little value in insulting the team members like this.

I'd argue it's not insulting to question a claim (i.e. 'we saved $6MM') that is offered with little explanation.

Regardless of position at some other company it will tell you precisely 0 about this specific situation.

That was not a nice reply for a non-insult. Do you have anything to add maybe?

> That was not a nice reply for a non-insult.

It's an insult if you dismissively explain basic things to the folks working on the project.

It’s not insulting to speculate in a conversational way around the errors we very very commonly see