You can't normally talk to an object without a reference to it. This means data flow can be used to scope control flow. MOP indirects everything through a big g

You can't normally talk to an object without a reference to it. This means data flow can be used to scope control flow. MOP indirects everything through a big global variable, so anything can talk to anything, and calls it a feature. Object interfaces in static languages are static, most of the time. Thus a lot more of the conversation can be statically analyzed for correctness.