As another commentator said "do nothing" is a decision. There's a distinction between "don't make a decision and hope someone else makes a decision" and "we acknowledge we're deciding to do nothing about X until/unless Y"

The people in leadership positions should be active participants, and not all decisions will be ones they are are able to make locally - but they should feel comfortable to present a POV and recommendation/tradeoffs upwards when that's the case. If the buck stops with them then they should be aware that "do nothing" is a decision that they are making.

The person who decides owns the risk. The cost of waiting is spread across the whole team, so escalating is usually the safer move for the individual.

“Do nothing” can be a decision