Good point! And will definately hold better than electrical tape
What I have found with Anderson connections is sometimes the connection point is bent on initial installation / wire insertion. You'll know this is happening if you can pull them apart with zero effort (almost falls out).
I have found that putting the connetor down on a flat surface and pressing down firmly or even giving the end a good pinch straightens the contact point and you get a nice solid "SNAP" when you put them together.