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Granted, the warning says clearly "If you deselect Undetermined, you will not see most content", which places the onus on the individual user, as apposed to logic built into Lemmy on which posts/comments can be viewed, while also leaving it to each user to have to weed out alternate languages for their views which are incorrectly set. This is indeed leading to many posts simply not appearing (as designed and intended), which is less than ideal when trying to grow a user base/community.
The intent is to label content by language so that people can easily filter out languages they can't read. The presumption that English, say, is the default language because the big websites are all US based doesn't really hold in the Fediverse, where a lot of users, historically, were from Europe.
But the feature's just kind of... broken right now, though.
The Lemmy UI is terrible and as tagging isn't actually mandatory in Lemmy, most posts just fall under "undetermined".
Kbin has mandatory tagging - yay - but the list has maybe only like a dozen languages and I don't Kbin has the filtering implemented anyway. Though I have to say having Finnish as an option but no Swedish does make just a tiny bit happy.
Yeah, as far as I can tell in the Lemmy UI there is no way to select a default post or comment language.
I'm not sure if mandatory tagging is such a good idea. Et si vous mélangez deux langues dans un seul commentaire?