Starting situation
Imagine that at the end of a long ascent, perhaps even in a very lonely area, you realize when converting your splitboard that you have probably lost the screw of your anchor strap in the last few meters and the part is only hanging in the nut. This means that a descent is no longer possible. You have 1000 m of terrain ahead of you. No way. If you don't have a way to repair it, you're probably a case for the helicopter.
Your well-earned descent is gone and the pilot will shake his head.
A remedy here is either a (PowderGuide) skistrap, as you read here, but also other forms of tying down with cable ties, armor tape, rep cords etc. or simply a suitable screw or screw and nut combo if you've lost everything.
But hey, you just have to have the stuff in your luggage.