[nsteel]

For me, the main technical difference with Pydantic over the host of other similar libs is runtime validation. Which, with modern typed Python, you often don't need and which you pay for in speed: even Pydantic v2 is still relatively slow.

"Pydantic models for UI components" seems odd to me. Surely runtime validation is unnecessary in this application and static analysis is a better fit. I am guessing it's the close integration with FastAPI that really holds the value here. For me, ideally this wouldn't use Pydantic but given the author and their situation, using Pydantic is probably the main reason this project actually exists.