1) naming yourself "hearthstonebad" isn't conducive to good discussion
2) the commenter stated his time budget: an hour a day. This doesn't seem excessive to make the argument "rank is merely a function of game time"
3) 2-7 choices is an under estimate. Past MtG pros have observed that attack ordering has more tree breadth than MtG attack phases. Saying the choices are straight forward is misguided when top players will consistently make the better choice that weaker top players miss
4) a high amount of randomness doesn't necessarily negate skill. See Poker
Indeed, the skill is designing a deck to be less sensitive to such randomness, adapting a side deck, reading the opponent's tactics to counter them or exploit them and responding correctly to the challenges if things go wrong.
Essentially, making your own luck.
Tree depth in card games is about the same as the deepest card combo times hand size, and for every card you can also hold it or get it burned.
2) the commenter stated his time budget: an hour a day. This doesn't seem excessive to make the argument "rank is merely a function of game time"
3) 2-7 choices is an under estimate. Past MtG pros have observed that attack ordering has more tree breadth than MtG attack phases. Saying the choices are straight forward is misguided when top players will consistently make the better choice that weaker top players miss
4) a high amount of randomness doesn't necessarily negate skill. See Poker