I have always been against 1 hitters.
There were one hitters in the old days too. Or rather heavy hitters that could 1 hit folks in certain circumstances.
Remember prepatch weapons? Bugged bows?
And it was really hard to train str (hp was derived entirely from str) and have it remain there. So the average hp for players was lower.
Still, these were nothing like the glass swords. Imho, it would be better if these could only be used in defense. Ie if you aggro someone, any glass sword you hold in your hand/backpack will shatter. So effective making these useful as a deterent against pks, but useless to pvp'rs seeking action.
Could be a way to control pk activities.