I would agree with the op that draws are a problem if it was in arena. In tw however i think it’s one of the differences. The team you are using on defense is not usable on offense. It’s only purpose is to defend. Which make, as other said, draws an acceptable result imo. They prevented you from moving forward which was their sole purpose. You get the advantage to 1. Choose who to use against who and 2. Actually play against an ai. If you can’t win, it should have a cost.
In arena draws are basically wins for the defending team that is also the attacking team, which i really don’t like at all, but it is what it is and i basically dislike everything about that game’s arena system anyway^^ so one more thing won’t make a difference.