Hearthstone is a fairly simple game to learn on its own. Sure it's difficult to master but nearly any competitive or strategic game is. I don't mind having his be extremely similar to Hearthstone, in fact I really like the flag/hero idea Coco came up with. My only concern is that this will just be a reskin of Hearthstone in the end. This will probably never get anywhere big, but even Blueh didn't want the Graalians card game being exactly like Yu-Gi-Oh!, and it's merely just a personal preference.
I'm honestly not that concerned with gameplay and such, the original cards I made were simply for fun, and Coco's templates just make that process even more fun! I think it's just nice to have a few ground rules so things aren't all over the place, because then the idea of having fun with this would become very messy and obscure.