(If I am missing anything, please, correct where I am wrong here. Also, please note that this topic is not meant to have a negative tone whatsoever. Please don’t read that type of tone into what I am saying. This topic was created genuinely. My intent is definitely not to upset anyone.)
Here are a myriad of low ranked players that enjoy to blame their lack of success on RNG in this game without skill.
Why does it correlate that these lowly ranked players never seem to be high ranked? Because skill is involved (depending on class and deck). Look at the discrepancies between high legend and the fact that statistics prove various deck and classes perform better as you look at higher and higher ranked players. Evidence skill plays a major role.
I play more than the average player and despite that, have never reached legend. Meanwhile, others acquire this rank and beyond because their skill level justifies it.
If you are hardstuck it’s a you problem: lack of knowledge, lack in proficiency in mathematics, and general ignorance of the meta.
In short, skill is alive and well and is demonstrably proven to exist considering what I wrote above.
It’s okay to admit you aren’t the best player in the world. Try your best to realize this and (watching replays) to increase the optimal plays you will make.
Topic inspired by the crows that are unsurprisingly low in rank that prefer to use blame RNG and lack of Hearthstone skill to justify their poor performance.
To all naysayers that cannot climb: LEARN. Get to the point that you are able to (typically) know your opponent’s plays before they go off. Additionally, work on your mathematical proficiency.
Stop blaming outside forces for your failure. Look inside and watch replays to see that you could have made better decisions.
I’ll end this with an anecdote. I am now D10. I play this game more than is healthy. If it were merely a matter of playtime, I’d be number one legend. I am not. I wonder why that is, hmm? And to turn that question towards you, why are you not in high legend? According to many players, reaching legend is a freebie. It is not.
Edit: Something else worth considering is the fact that as one looks at the statistics while looking through the earliest ranks to the highest, that skill ceiling makes its appearance.
Edit: Due to confusion, I must add that indeed time investment is also very important. My main point is that time investment is not the sole reason for climbing.

As long as it falls within the parameters of the forum CoC, there’s nothing else we can do but to try and disprove his thinking.