The game will be utilized in a cloud server, which means lengthy downloads and near-constant updates will not be required for the game. Phantasy Star Online 2: Cloud will run at 30FPS and there might be lag pending your network environment. Despite the system will run on the cloud, Sega still recommends a stable network to play it.
FYI, the Switch version can’t play with versions outside the PC version. Yes, that means there’s no cross-play with the PlayStation versions. However, PC and Switch use the same Sega ID.
Phantasy Star Online 2 has been available across Windows PC, PlayStation 4, and PS Vita in Japan.