That's.... not what the poster was saying. Prestige TV extends much farther than the mafia genre, sopranos was just the turning point when higher budget dramatic things were more commonly greenlit.
The Wire, Breaking Bad, Watchmen, The Expanse Game of Thrones, The Walking Dead, Mad Men etc all absolutely blow X files out of the water. And while I do love X files, the monster of the week format is not even in the same ballpark as those long form character dramas.
I think you might be letting nostalgia blind you to how great television has become.
I mean, I am not a huge fan of the show and didn't finish it. But the first season was stellar. But that aside, reading your other comments it seems like you don't like a lot of modern shows. Which is fine, but personally I find older stuff I watched when I was a girl just sorta meaningless. X files had so many skipable episodes without serving the overarching plot. I'm honestly kinda baffled that you would prefer monster of the week instead of expanse and breaking bad, but you are allowed to think as you please. Just seems at odd with two of the most higely praised shows of recent history.
And I don't super appreciate being called bro... >_>