The title of “hardcore gamer” is not an identity; it is a temporary state of being. Many people start playing video games, and some of them keep playing more and more of them until they develop skills and tastes that place them into the “hardcore” category. Hardcore gamers stay hardcore for years or decades, and then their reflexes fade or their interests shift and they find themselves enjoying different things.
There’s this mistaken feeling among players who self-identify as “hardcore” that they’ve been left behind, that there’s this shift in the culture of development that has abandoned them. This is mostly nonsense. It’s true that for about a decade, most every game was made for a hardcore player… but that decade was the worst one in the history of video game design.