Milking a franchise exists if the sequels become progressively worse each iteration. Like everyone's Ass Creed example, I think AC2 was the pinnacle. All of the AC2 sequels just added garbage that ruined the original gameplay (call in buddies to trivialize content, some stupid tower defense garbage). Changing locales weren't interesting either, as AC3 was pretty bad imo, especially with such a drab character. Then comes AC4, in which they get it when it comes to changing up the gameplay. The Pirate ship part made AC4 so unique and cool while the assassination takes a more sidelined approach. Then back to boring, uninspired garbage in AC Unity and 5. It's only milking if you're just putting out poor effort after the peak.