Do souls serve a purpose any more?

[Vyxn]

Today I finally logged onto my Warder since Gracia went live and I noticed that Abyssal Blaze, Double Thrust and Penetrating Shot are listed as consuming 5 souls. However, those skills consume up to five souls and the skills were even usable when I didn't have any souls stored. At first, I thought that the attacks would do some base amount of damage and consuming souls would increase the damage, but I'm not really seeing anything like that. (There have been a few instances where Double Thrust consuming two souls did less damage, on the same type of mob, when it consumed one soul. And, yes I know, RNG.)

So, what I want to know is does the consumption of souls have any effect on these skills any more? Is this intentional or a bug?