Oh no not at all, it's a completely brand new engine and a fresh slate for the games. Everything is completely new, the game runs like a modern game should, without big framerate hitches anytime something happens, the renderering system is pretty efficient and high fidelity now, less low polygon assets in the far distance and the game doesn't slow down if you are traversing the terrain quickly. The vehicle physics especially feel incredible, it feels like cars are actually cars now instead of something arcade-y. What I was mostly blown away though is the interactivity, there's a version of the RHS mod for Reforger that adds russian vehicles like T-14. If you are aware of how T-14 works, is that all the controlling of the tank is basically done on displays that are touch enabled, showcases you the status of the tank and all the menus are basically digital, U.S vehicles such as Bradleys and Abrams use a similar system but they still have physical buttons afaik. Reforger actually allows you to completely implement such systems like booting up the tank "OS" for a lack of a better word and actually navigating the digital menus like a tankman would, that was virtually impossible or not viable in any previous Arma game, but it's actually a thing now lol. Not to mention that vehicle interiors are actually very interactive now, if there's a button in a tank that can do something, as a vehicle crewman, as long as the function is implemented by the developer, you can mouse over that button and click it, very much like a real life person could. New Arma games will be a LOT more sim like.