I kinda see where OP's coming from. After TLoU and Uncharted, Sony appear to be directing their exclusives towards that style of gritty narrative derivative from those games. Let's face it, God of War was never a franchise about deep storytelling. It was all about combat and simple puzzle solving with some platforming in between. Kratos was just an angry dude and that was it.
I 'm not a fan of such drastic changes to GOW, they could try a new franchise, but hey, it's what appeal to today's casual public, so whatever.
Then there's games like Days Gone which could easily be mistaken for a TLoU spin off, and all the aforementioned exclusives also show signs of this overly dark, gritty, edgy, atmosphere with a heavy focus on dramatic and "deep" storytelling. I'm not saying these elements are bad, but does every future first party really need to pursuit that?
Like was mentioned here, the Marvel movies are a good example. Though they have different settings like Guardians of the Galaxy with it's crazy sci-fi, Thor with it's nordic mithology fantasy, and Captain America's political action movie, Black Panther with it's utopic and tribal drama, etc, they all feel the same because of a number of tried-and-true elements that are applied to every single movie. Yes, it's cohesive because they're movies from the same publisher, but it feels tiresome after a while. That's why Logan and Deadpool felt so fresh in comparison. Though they're Marvel movies, being honed by Fox made it easier to ignore the MCU formula and try different things.
Overall i think that's what OP's was trying to say here and if so, i agree with them.