It comes down to who is driving the project forward.
With someone like pre-UMG Mori, Bae, Kiara, Watame, etc, the talent themselves is the project manager, though some communication is routed through management. Kiara is working on an album right now and the stress of trying to coordinate with the producers and MV-makers to get things done by a release deadline is keeping her awake at night and giving her nightmares.
IRyS would say "oh I have recording scheduled this week" "finally it's ready, I remember recording this 9 months ago" "yeah they showed me the songs and asked for feedback" "they ask me about everything, maybe even too much" "oh they released it without telling me, huh!". Not actual quotes but I remember all of these things happening.
I don't know if it's IRyS specific or vsinger specific, but AZKi is much more deeply involved than IRyS so I would say it's just how IRyS's contract or process is done.