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Spent the last year building a customer-facing AI agent for a Miami law firm with operations in Colombia. The accent question never came up in the build. The knowledge question came up constantly.

Half the inbound clients were Colombian families navigating US immigration. The agent had to know which apostilled documents the Cancillería typically processes in 3 days vs 3 weeks, that "documento de identidad" in Colombia is the cédula not the DNI, that the consulate in Bogotá closes early on Fridays. None of that is in any LLM's pretraining; we hand-built and update the knowledge files monthly.

Your binder-table-at-the-airport story is the deeper one. AI can fake the voice. It can't fake the lived experience. Cheaper to invest in the knowledge files than in the accent layer.