False; all games are known for their gameplay. There's plenty of wiggle room to evolve it from game to game, but you can only push so far before it's unrecognizable, like what they're doing with TESO by throwing out all the gameplay elements except for the hiking simulation part and replacing them with elements unoriginally lifted from previous MMOs. It'd be like making a Call of Duty game set in medieval Europe; it wouldn't play anything like the other games of that series.
Ugh........... you obviously seem intent on purposfully misconstruing what I say to further a silly argument.
But if you must know changes in gameplay are irellivnet. Command and Conquer was turned into a FPS, and that FPS was still Command and Conquer.
What makes a game series is not its gameplay, but its world, its characters, and its lore. As long as they keep that, which they seemingly are, it can never NOT be a ES game, regardless of if its a FPS, RTS, RPG, Fighting game, etc. etc.
This silly notion that changing the gameplay somehow makes it less of a ES game is........... well exciedningly incorrect and highly close-minded