for everyone who still hasn't noticed in 2k19:
blizzard does this on purpose. its incredibly easier to balance a meta around a few very strong decks than balancing it around all classes with many different decks.
ultimately this also generates WAY more $$$$ for them as people have to shift between OP classes/decks quite frequently if they wanna stay competitive instead of having a balanced game where you could focus on lets say the same 2-3 classes <- that would make f2p insanely more easy, which is way blizzard purposely does not even try to create truly balanced metas.
so yeah deal with it and have fun or look for another gam honestly