You can view a stream of everyone’s journal posts here: https://www.inaturalist.org/journal/
It’s kind of chaotic because they’re used for a variety of different things - identification guides (I think the Guides feature is weird to navigate), project updates (encouragement for members of a project), and personal updates (kind of like facebook posts I guess, but generally longer).
I don’t think they’re outdated; it still functions perfectly fine the way it was meant to. Plenty of people still use the feature to make good contributions to the community. I mean I think many people would appreciate this update but that doesn’t completely break them.
I also don’t really see the purpose of a feature that isn’t public?