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Is there are any reason to pick Flask over FastAPI for a new project in 2023?

Yes, I've written about this comparison in detail https://pgjones.dev/blog/fastapi-flask-quart-2022/.

Flask definitely wins the documentation and maintenance department. FastAPI has "shiny" docs. Flask at least has an API reference.

Yes, I don't get it when people praise FastAPI's docs - they're more like tutorials and examples rather than documentation.