Weapons that can use disdain want the left side of the sustain nodes anyhow.
Disdain sucks, backstabber is situational, anoint in blood is by far the strongest starting point, would only make sense for you to be able to branch out of either way.
why do you think disdain sucks? and why would i want the left side nodes just good for ranged if i play melee with disdain, anoint in blood only good if you play bolter with zealot or not, voice of terra seems ass and u can get everything else by going disdain as well, if u play just melee with like relic blade disdain seems good to me, would suck for it to be switched with anoint in blood cuz then i’d have to spend one more perk point