The reason you remember those big story moments and cutscenes is because those random encounters and challenges along the way made you earn them.
I would appreciate it if you don't presume to know why I remember parts of a game versus others I forget. That might be why YOU remember them, but that is most definitely not why I remember the scenes. I don't recall the Sending cinematic of Yuna in FF 10 as a hauntingly beautiful moment of character development, because we see her stepping up into a role in her society, that is traumatic, for everyone, because of the hour of random shit monsters I plowed through to get to that scene. How she believes it's her duty to help the people, and to send the souls so they don't come back as monsters. How we see her, terrified about if she can actually do it, but determined to be the best she can. How she turns a moment of utter tragedy for the village, into a moment of mournful beauty, and closure, and how it slapped the somewhat still cocky Tidus, into realizing that shit here was far more serious than he actually realized. And how it was the start of his bond with Yuna, and his determination to try and keep her from having to do anything like that again.
If you think I love that scene, years later because of ANYTHING to do with fighting mindless trash mobs as some form of "earning it" crap, you are high. And have honestly probably played too many fucking From Soft games, and had your brains bashed in by ramming your head into a wall too many times against those bosses, to think that repetition is a good substitute for good storytelling and narration.
Don't tell me I enjoy the cutscenes because I slogged through hours of shit fights, when I specifically tell you I DISLIKE that stuff. You are not in my head, do not try and say I like something that I don't like, because you don't like my answer.
And if the "substance" of your game, is mindless fighting, that has no actual, narrative content, then your game is a shallow piece of crap. Since you brought up GoW, for one, you don't have to do any leveling on the side in that game. If you stick to the story points, and aren't trying for the epic sidequests, you can play through it without much issue. If you do choose to go do the side stuff, as an option (not mandatory because the game forces you to be stronger than you could be without it), then yes, it becomes mindless grind. But it's at least optional. And two, while you are doing that sidequesting, you are having plot elements between Kratos and his son, and the head, to further flesh out the game. So you have an expanded narrative while grinding, which at least gives you something to ponder and discuss with a friend, or wife in my case, while plowing through trash. There is no such narration or discussion in JRPGs, where all you have is a sprite wobbling around an overmap before it dissolving into a fight, which again, has zero narrative content at all. The entire cast becomes effectively mute for several hours while you just push through fights.