That's just how it works when your backend is a hybrid software that utilizes a low-level compiled programming language and a high-level language that runs in its own VM. You can use the latter for gameplay features, and can hotfix on the go, and then for core changes you have to restart, which is also why WoW will hotfix the latter on the go, usually every day on an expansion launch, whereas they defer the bulk of backend changes for the next weekly restart without continuously disrupting the game for players.
