Well they can inject skills and become self sufficient in almost anything significantly more rapidly than before. So there’s less need to appeal to someone else’s services or different spec. You can be self-sufficient from your first week more or less, it’s that easy now …
Also because well, the games so fkin old, most of the core playerbase either already peaked end-game for all their chars, and left, or the ones that stuck around are entirely self-sufficient.
Interaction dies when you have everything you need.
If it were me, I would introduce serverwide wipes of assets and skillrot, but thats just me