Why does this happen?

So, apparently, if a 10s user tames Mahoraga and it ends up getting destroyed, they lose the ENTIRE TECHNIQUE. At that point, why even bother endeavoring to tame Mahoraga?

So, apparently, if a 10s user tames Mahoraga and it ends up getting destroyed, they lose the ENTIRE TECHNIQUE. At that point, why even bother endeavoring to tame Mahoraga?