Can't French citizens in the United States apply to a Chinese L (tourist) visa through an agency?
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Accepted answer
I've asked a few more people and it seems that indeed French citizens in the United States who want to apply to a Chinese L (tourist) visa have to apply at the Chinese consulate/embassy in person.
French citizens typically (always?) require in person interview. It is
not written rule. The reason I was given is that the French government requires Chinese citizens in the United States to apply for French visa in person, so the Chinese are reciprocating (which I understand 100%). https://www.visahq.com/france/requirements/china/resident-united-states/ (mirror): "The applicant must reserve an appointment and appear in person at the nearest Consulate of France to have their fingerprints registered."
Agencies can, however, provide pickup service after one submits the application.