Think of it like a shop that you create. You’ll know what’s in the shop if you build the deck. I’m sure you’ll get the hang of it.
I wouldn’t say the lore would be messed up. We hardly know enough to claim that. Also the affinities are now more of a way to tell what kind of cards you’ll get. Death will have debuffs and leaching. Growth will have survivability and buffs.
Also now cards don’t have to do the same thing in multiple affinities, so cards can be more unique.
As a bonus heroes can use any deck you make now. So yay.