To be fair, it’s not a good comparison. Or if it is, then we just have to agree that Hearthstone, like chess, has two versions of the game: competitive and casual.
Casual chess is all about creativity and outplaying your opponent. Ideally, none of you knows a lot of theory and openings because it shuts down creativity and set of possible games. Similarily, casual hearthstone deckbuilding works the same - you don’t even want to know the meta-netdecks, because they’ll just limit your ideas and creativity.
Competitive chess is all about memorizing NOT JUST OPENINGS, but complete games, move per move + their transpositions (when the order of the moves changes, but the game ends the same) + all the possible check mates in each position, and THEN trying to outplay an opponent who knows almost all that you know, maybe slightly less or slightly more. Similarily, meta-netdecks are what chess players have to memorize and play around - complete, perfect and at least thus far, proven to be optimal.
If you can’t agree about which way to go, you should just agree you’re not playing the same game, at all. One is about memory and strategizing, the other is about creativity and execution.
Either way, it’s still not a great comparison, since chess doesn’t have a random aspect to it, unlike Hearthstone. Unless you play chess 360, but that’s another topic.