[50sDad]

And if such a blast was a contribution to LIFE BEARING planetary formation, it would also explain why we arn’t falling all over radio signals from other species...life may be rarer than we thought.

[null and void]

Yup. Similar to the old “passing star pulled enough matter from the sun to form planets being a rare event and that’s why it’s so quiet” explanation.

I think BIG moons are rare, and therefore no tides and therefore no high tidal pools with the variable concentrations of salts and organics sweeping trough favorable domains.

Or who knows? Maybe we are awash in signals propagated by other than electromagnetic waves?

[MrB]

life may be rarer than we thought

I'd say "unique".