I think your observation may have to do with privacy? If using a pseudonym one can't share too many details about their personal life or local area for fear of getting doxed, and if using one's real name there's the need to preserve the agency and privacy of the people close to you (I think the fediverse has so far followed Twitter as opposed to Facebook, in that most people are connected to a different, mostly virtual, social network with little overlap with the one they participate in physically, so it may feel strange to talk to about them with "strangers" rather than with them). In both cases, I think there's a tendency to compartmentalise one's public identity on social media and only post about certain topics.

I hope Bonfire extensions like Topics and Circles & Boundaries (and Groups soon) can help address some of these. Not just as a technical "solution" but in meeting some unmet needs for more people and hopefully make federated social networking more integrated with the full spectrums of our social/political/economic/communal lives...