I can see it now.
A future fight involving an incredibly strong foe,
stronger than the current enemy,
will find a weak point in his diamond sword
and smash it.
Only for the MC to somehow make an even stronger weapon.
Y'know, only if the manga goes on long enough.
@Umesan exactly, wrote something like this in earlier chapter. the girls are still acting like the damsels in distress. hell, i've seen female characters in other wuxias more independent with the pride of the male characters