It's made more noticeable because of the inept strategy the Twins batters use. Today Josh Bell tapped his helmet with two outs and the bases empty on a 2-2 pitch called a strike. Supposing that the third strike got overturned, what tiny fraction of a run on average would stand to be gained by extending this failed inning, versus the risk of losing half your game allotment of challenges that early? Success wouldn't even have translated directly into a baserunner.
Wallner's already embarrassed himself twice with ABS challenges. The manager needs to lay out the ground rules for a batter challenge - it has to be with a 3-ball count, or a late inning with runners on, and so forth - or else just tell them don't ever challenge period and save wear and tear on their limited brain cells and reserve those calls for their catchers on defense.