Do you have a future plan to add automated post text translation? If the users can see the feed in the language they are used to read (based on their preferred language setting) I think they'd use Primfeed a lot more.
Some residents from Japan that I know expressed that if the feed is mostly just in English only, they may not be (and cannot be because of the barrier, similar to TLDR effect) too active on Primfeed.
If this automated translation is implementted, this is not only going to be a unique feature of Primfeed but it also should greatly increase the userbase not only from Japan but from many other countries since something like 40% of total population in SL are from non-English speakers according to https://www.similarweb.com/website/secondlife.com/#traffic
The translatoin does not have to happen everytime someone with different langauge sees a post (very costly). The Primfeed system could do translation initially first, but then the translated text can be stored on either server cache or more permanent storage for redisplay to reduce latency and translation cost. Obviously, this can be optional for the user who do not want to use the feature. Also it could be an option for posters (not allow translations) either per post or all future posts setting or both. This also could be tied to Primfeed account tier (paid / unpaid) probably on poster side.