> Net Neutrality wouldn't prevent these kind of peering battles.

That depends on the specific shape of the rules.

> Comcast had the Netflix slow down and it's currently legally required to follow net neutrality.

Comcast is currently legally required to follow one version of Open Internet rules -- a version that is weaker than many net neutrality advocates preferred.

Yet somehow it did. When you're comcast, it's easier to punish for months on end and muscle $$$ when you already have $$$ to delay consequences via lawyers and politicians. It's not like anyone is going to jail or being shot, so there's no real credible instant threat here to prevent them from acting in their current monopoly form.