Should We Build on a Hosted Assistants Platform?

Your product manager wants to launch an AI feature that answers questions from a knowledge base and can run small data-analysis scripts on uploaded spreadsheets. They propose using a hosted Assistants-API-style platform because "it does threads, retrieval and code execution for us, so we can ship in two weeks instead of two months."

1. What are you actually gaining and giving up with this choice, concretely?
2. What one or two questions would you ask the PM to decide whether this trade-off is right for this product?
3. Describe a plausible future trigger that would make you revisit this decision.