They aren't ruining the game for you, if you want to play it that way that's fine and you'll be done with it and move onto something else.
aRPGs like this one have always been about the end game for the majority of players and is why people kept returning to D3 each season despite the actual content not being much different. The fact streamers like Kripp understand the numbers and how the mechanics work doesn't make them no lifers, particularly when they're the ones making money off playing the game unlike us who spend hours on the game for no real reward
Basically, people want to play the game in different ways, no need to insult anyone for their choice...