Myself I just don't like the -10 damage "trick". Instead of being exceptionnally good Lifedrain weapons become near useless, and everyone will switch to Duskdagger+Sword of Quickness or whatever combo instead. Up to the time when someone will mod Duskdagger to be dam 2 nostr and Sword of quickness 4W
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Bloodthorn as a Blood booster but useless weapon is fine.
Arralen, I'm not that sure STR30+ SC are that common.
In fact only few Pretenders have that level, even Demons/Devils are in the 20s...