If you don't use them and just run some webbing or similar, dynamic forces in a factor >2 fall will either snap your spine or the webbing, whichever gives in fi

If you don't use them and just run some webbing or similar, dynamic forces in a factor >2 fall will either snap your spine or the webbing, whichever gives in first. https://en.m.wikipedia.org/wiki/Fall_factor https://en.m.wikipedia.org/wiki/Fall_factor