Today is the last day of niconico's current update designation, (Re). Tomorrow, a new era begins!!
I'm not sure this is 100% true. Lots of Vocaloid producers post their Project Sekai scores on Twitter and get a lot of engagement from fans. A lot of small-time producers have talked about playing the game, too. The people that are primarily fans of "project sekai" might not also be music producers, but I think sentiment around the game from people that make music is generally positive from what I've seen-- probably because it portrays the experience of "being a vocaloid producer/user/member of the community" in such a varied and positive wayI don't really think there's that huge of an overlap between the Project Sekai fandom and vocal synth users