Suppose Walt Anderson doesn't ask for clarification, and the back-and-forth goes like this:
Dak: We want to kick it. Kicking it that way.
Walt: Dallas has elected to kick.
He gave Dak a chance to clarify and Dak answered both "yes" and "no". I can't blame Walt Anderson because he was trying to get it right and Dak more-or-less replied, "we're going to defer, but we're also going to kick".
At the same time, I applaud the league for making the right call in overruling Anderson. I don't feel either displayed poor judgement given their respective circumstances. Walt had to make a decision in real-time, and the NFL Brass was given about 90 minutes to review and reconcile that decision. That's exactly how it should work; officials do the best they can and if it turns out to be wrong then their decision is overruled.
Don't really understand the backlash on this one.