Right now bodkins appear the only viable choice for people due to the pierce damage. I have to say I did notice a difference between the two against armour but little difference against weaker opponents.
Anyway the idea is, that in order to make normal arrow types more viable could it be possible for some to switch to pierce damage at the MW level? So for isntance:
1. Barbed Arrows 4 cut as a base damage --> Large 4 cut --> Sharp 5 cut --> MW 2 pierce
Bodkins are hellishly expensive to use and so I just thought it would be nice way of switching arrows to pierce after a certain level of heirlooming which would also make those arrow types more viable in the long run.
Bearing in mind this wouldn't benefit me for a while because I don't have any arrows loomed.