There's this mentality I see with a lot of STALKER fans that seems almost revisionist, where their idea of how difficult the series should be is more based on mods like Misery (which is as miserable as the title implies) and mods descended from it. But if you go back and play the original games, they really aren't that hard, just not as easy as many contemporary titles. But for those fans, if you aren't having to spend 18 rounds of buckshot to kill a boar, or getting killed in one hit by a feral cat, then the Zone isn't hardcore enough! And like you said, God forbid you use a mod that lets you carry more or makes artifacts better for you.
My recommendation for new players would be just to avoid mods like Misery or Anomaly if you're playing the series for the first time, since you're going to have a rough and not-very-fun experience trying to grapple with the game's systems when they go out of their way to make it unfair for you, since those mods have always been more designed for people who already know what they're doing.
The advice I got when I started the series was to put the difficulty on Master, but that's because the jank causes it to make the enemies and you deal more damage. So, if you're stuck with the shittiest, most inaccurate pistol on earth, at least you aren't shooting spitballs, too. Maybe that's where this whole "STALKER is the most hardcore of FPS games and you gotta make it super hard!" mentality came from.