I have to admit that I'm still very much on the fence about Call the Midwife, since it is so closely based in real world events (although after doing some further research I see there is controversy about whether more recent series have deviated too far from the source material ...). Almost all of the tags seem to me to be the sort of thing that could be written about in sociological works or overviews of medical history, rather than something strictly fictional. Or, to put it another way, creators creating works based on these tags wouldn't be inventing new ideas based on the information in the canon, they'd be doing secondary research about real world events. So I'm really not sure that it counts as worldbuilding.
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I have to admit that I'm still very much on the fence about Call the Midwife, since it is so closely based in real world events (although after doing some further research I see there is controversy about whether more recent series have deviated too far from the source material ...). Almost all of the tags seem to me to be the sort of thing that could be written about in sociological works or overviews of medical history, rather than something strictly fictional. Or, to put it another way, creators creating works based on these tags wouldn't be inventing new ideas based on the information in the canon, they'd be doing secondary research about real world events. So I'm really not sure that it counts as worldbuilding.