We should let cache=true by default enabled. This then avoids re-creating new beans when you refer to a bean by its class name, and also avoids looking up the bean from the registry each time, and so on.
In other words it acts as a singleton scoped bean.
If people want to create a new bean per use, then they can set cache=false.
And we could update the documentation to indicate cache acts as a singleton scope. Or we could add singleton=true|false as the option and deprecate cache if its a better name.