I am baffled at how many on these forums complain about 'bad RNG' and then when an obvious change makes Discover 'bad RNG' that people are ok with this.
Are you really baffled? Because in every one of those salty threads you mentioned, there are just as many people defending RNG as there are complaining about it.
After five years, you should realize that this crusade against RNG in Hearthstone is never going to go anywhere. The devs obviously love it, as do plenty of players. Even the puzzle box is receiving a lot more affection than I ever would have expected, though I do get that some of it is tongue-in-cheek.
Can someone explain to me how they think more RNG is good for Hearthstone?
The goal isn't to just arbitrarily add RNG to Hearthstone. The goal is to reduce the consistency of Discover effects, which have proven to be overpowered -- especially those that draw from a narrow pool such as Mechs or Taunt minions.
The so-called "bad RNG" isn't going to creep into the competitive meta, because as the consistency of these cards drops, people will stop using these cards. Yes, some will still go full casino, but those people will never get to high ranks that way. They can continue to have their memes, and the rest of us don't have to watch people win by abusing the class-card bonus.
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Complaining about RNG in Hearthstone won't convince anyone that it's a bad thing -- it only makes them think you're too dimwitted to find a game that suits you better.
But it's also a stealth buff to something like Myra Rotspring. That will almost certainly not be relevant because that card's stats are straight doodoo, but it's worth noting. The buff to power of creation is certainly relevant. Ditto for Togwaggle, although the wand is still usually the choice.