Some splices *are* more important than others. It's easy to see when you think about the consequences of a splice failure. I am so paranoid about open neutrals on 3 wire circuits, I should probably start soldering those.
Yes, the splices leading to an oxygen pump are more important than the ones heading to a video game.
But I will not agree that the common neutral of a is any more or less important than the hots.
A break in either is an unhappy customer and a call back.
Just because a neutral opens in a MWBC does not mean full line to line voltage will be applied to the equipment.
I have fixed open neutral that did not damage any equipment and I have fixed open neutrals that did 'zap' equipment. It depends on the circuit loading conditions.
I will probably end up using the push on connectors for more things as time goes buy out of nessity....it does not mean I really like them.
