It’s not that niche, I’ve seen it all over.
It’s just a feeling in general, so take it with a grain of salt, but I think it’s more that it’s not that high of a priority on a website that focusses on teaching you kanji, which in itself have no pitch. The vocabulary is mostly there to help you learn all the different kanji readings, and how they are used. So teaching the pitch accent of the vocabulary is not that required for learning kanji.
Furthermore, they focus more on content and learning structure updates, which is a lot of work. Recently they looked into the best way to teach transitive and intransitive verbs for example.
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