Not really. It isn't an advantage. If you know what's in your deck, just remember what you drew and played.
It is an advantage. When you are playing games in row sometime two games can mix each other in your memory. With a decktraker that source of misplay is gone.
Would be nice to have something on iOs thou
Especially on Arena. As the deck is random and change every couple of games it is more difficult to remember what is in the deck. I usually overlook the deck like a 10 sec to remember the draft and the synergies and the number of turn 1/2/3 and start the game
From what I understood the way iOs separate in-app data means that it is not possible from another app to access the information from the game.
Meaning Deck tracker as Kripp has cannot exist on iOs.