1. I've never claimed to be an expert.
2. Even if I had made such a claim, Hearthstone is a very simple game (it runs on phones, FFS) with very simple game mechanics and a small card pool. It wouldn't take more than a few games to become an expert anyway.
3. My HS experience isn't limited to just playing HS. For those of you who live under a rock, HS is literally a rehash of the Wow TCG, which is a clone of MTG, which is a game I've been playing for the last ~20 years. Many things that apply to MTG, apply to HS. Someone who is good at MTG, can hop into HS with very little problems and become a good player in a short amount of time.
4. These are facts. You should probably learn what those are, and how they are different from opinions.