There's nothing wrong with singletons when they're used when needed. They've been particularly useful in the Unity/C# development I've done on an MMO, both on t

There's nothing wrong with singletons when they're used when needed. They've been particularly useful in the Unity/C# development I've done on an MMO, both on the client and server. The problems someone listed in an answer haven't really occurred in our use as far as I know.