>>12512387If you want a real answer, its because Nijisanji doesn't really have this weird barrier that Hololive now has where the girls and dudes are mostly separate from each other because lol idorus and unicornfags, save for a few exceptions.
Niji set the expectation at the gate that the girls would collab with dudes as far back as Lazulight's debut, with Bobon being an MC along with Hana. They even had that before had with company get-togethers, where as Cover from what I can tell still treats the Stars as separate entities, who could collab with the Holos but probably wont always do so for fear of pissing off unicorns/gachikoi.
