Honestly the language selection in general is just a bad idea/baddly executed. Until people told me that those where the reason 4/5s of posts and comments never showed up, I didnt know that these settings existed
I then just marked all of them which took ages and ever since my experience has been so much better. If they really wanna have this feature, then all languages should be selected from the getgo. If someone wants a language gone they should opt out istead of opting into everything else first.
If lemmy hides most of its content for someone new who doesn't know about those settings, then people are less incline to stay on lemmy. So overall it seems badly executed. I hope its something they improve especially for new users going forward