They may as well not exist as far as I'm concerned. Personally, I couldn't care less about leaderboards so I ignore them completely. they are lucky in that Diablo is essentially their job and so they can put in the extended hours, but you really can't deny that the players at the top of the leaderboard are there due to skill. Dude pulled off a solo world boss kill in veteran HC due to knowing the game, items and classes inside and out. Once you have the full primal set then it basically boils down to skill, especially with people like Wudijo and Raxx playing in hardcore. If I could put in the hours that many of these guys can then I'd have full relevant (and probably perfectly rolled) primals. I am a very casual player due to work/family, and even I end up with a couple of primals relevant to my spec with only a week or so of cumulative play each season. RNG plays a huge part at the start of a season, sure, but by the end it's basically down to determination and skill.

Oh come on, if it was pure RNG you wouldn't see the same names at the top every season.

If you play a game to be on a leaderboard where you don't get anything for being on there, and that game is rng'ed to all then you're basically an idiot. Leaderboards for what? convincing someone you accomplished something in an rng set up game? Going to put it on your resume? Nope just something for people to be toxic about.

Diablo 3 group 4 leaderboards