It's not the only thing that is a little weird lately with DH. But yes, as a reviewer, when diversity is not part of the paper, "downgrading" the note because this is about European 20th century without any specific other marker seems a bit sad. I would prefer it to be a bonus only.
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But I do value that the paper supporting diversity, through authors or thematic, should be valued.
But I am afraid that the 2019 schism operated with computational humanities (CHR) or NLP4DH is gonna widen even more...
It would also allow for a better archival of production in the context of DH (abstract can be very light compared to the full presentation, which makes knowing what was said complicated...)