Yeah, from my own experience the 'manager' metaphor is just easier for understanding the flow of execution & adding-new-features/maintenance. Everything is in

Yeah, from my own experience the 'manager' metaphor is just easier for understanding the flow of execution & adding-new-features/maintenance. Everything is in one place, and when the systems do need to communicate it is usually in pretty well defined ways (eg. physics manager ticks--> passes collision data to entity manager which ticks--> passes scene data to render manager which draws the screen, etc) I'll go with whatever pattern works best in the name of Just Getting Stuff Done (with my own limited brainpower).