I don't know what that anecdote of a Renolock player in Wild using Malchazaar has to do with anything. There have been many times in HS where someone has made bad plays with subpar deck and still won. That person got lucky because I can assure you any Renolock running Malch is going to get thoroughly clapped by Patches decks.
The anecdote is because Renolock is being present as this super hard to create deck where every single card choice matters.
Renolock is actually Reno, Kazakus, Combo, and a bunch of support cards to make sure that the player has the time to use Reno, Kazakus, and Combo.
The deckbuilders working on optimizing Reno aren't these towering geniuses of Hearthstone, the only ones with the intellect necessary to finely craft this incredibly complex deck.
The deckbuilders who optimized aggro Shaman aren't these moron troglodytes who typed "burn" into the deck creation screen and clicked everything that came up.
It took skill (actual skill) to build both of those decks. Looking down on people because they used their skill to create a deck you don't approve of is wrong. (I'm not saying this is your opinion, but the post that started this whole conversation did.)
It takes skill (actual skill) to pilot both of those decks perfectly. There's a reason Amnesia took Aggro Shaman to a top ten legend finish and when I play Aggro Shaman I have a hard time getting over 50%. My (mediocre) skills in this game aren't in that direction, and aggro Shaman isn't as easy to play as control players like to say it is.
I say this as a degenerate control player who would happily play greedy decks all day every day if the meta and the ladder system were favorable to that archetype.
At the end of the day, I don't care what anyone thinks of other people's deck choices. I wish people on the internet would stop trying to demean people because of the deck they choose to pilot in a VIDEO GAME for FUN in their free time. It's literally the dumbest kind of gate-keeping and it's all over the Hearthstone social media.
I'm just gonna say it again Zoolock is and for the majority of its existence has been the most difficult deck in HS to pilot
I don't find any of the current decks particularly difficult or particularly punishing of misplays. We're a long way away from the era of Grim Patron Warrior, Handlock, and Oil Rogue, three decks that I believe were very difficult to play and very easy to lose with if you didn't know what you were doing. Maybe it's nostalgia speaking, since I have very fond memories of that era. We all have our biases. Maybe I find Renolock to be so intuitive because I played so much Handlock back in the day.