[anonymoushn]

It's not easy to tell all your players that their games don't work anymore or that they cannot use coroutines. Regarding the second point, more concretely: they no longer can attach a function to a game object that defines its behavior over any length of time, and they no longer can call the sleep() function to suspend execution for a length of time.

[kamac]

True, there’s some pain involved for the developers. The migration could happen over time, like unity3d did by deprecating scripting with boo.