The core gameplay concept is the same. But the gameplay loop was vastly changed by the technological and design changes from III to IV. On the GTA III's the enemies ran up to near you stood there and shoot you. On IV and V, they'd use cover appropriately, they react physivally to bullet hits, fall to the floor, get up again, sometimes crawl into cover, or get dragged by partners. Some go down shooting all over the place, or shoot from the ground before dying. The player can also use a cover system, with all modern cover functionalities such as cover swap, blind fire, etc. Vehicle physics got more nuanced, driver's AIs got more nuanced, the amount of physicalised objects increased substantially. Pretty much all aspects of the world simulation became significantly more sophisticated.
While the same can probably be said about the examples beforehand: U4, RDR2 and Dad of War, there is nothing about those games that wasn't done before in previous gen titles, with just simpler graphics. Not that all PS4BONE gen games are like that, but these specific examples happen to be precisely the ones that don't do anything that screams NEXT GEN TECH gameplay-wise. It's the presentation and production that evolved the most.
I'd say the 60fps 64 players Battlefield games on consoles, are a better representation of games that were made possible by PS4 and ONE. They were trying to get that done on PS360, but just couldn't manage. Came this gen, they were given more room to breathe.
I'd put the Battle Royale games on the same club. 60fps action multiplayer games on vast continental maps... GTA or RDR are the best examples I can think of, and their frame rate went from 30fps to lower.
It seems like this gen doesn't have that many inovations that feel outright impossible on previous consoles. Part of that is probably that game design and technology has matured enough that many extremes have already been explored. Another part of that is just that the processing power of the current gen was not dramatically ahead of the preceding one, it was mostly GPU gains that defined this gen. The incoming one is expected to be the opposite, which kind of makes it more exciting, from a game-player point of view.