Agree, it's not really something that you can really fix. Roar is just kind of universally useful. In this situation you will end up with a catch-all meta if you don't make everything useless so there can be no meta.
But I do think that there is something to be learned from Helminth and what it tells about power balance, the problem that I think Helminth really highlights is how BAD most powers that do not have some sort of scaling effect. Self-buffs like Roar, Warcry, Firewalker, and Eclipse always outperform something that has nothing but a static damage value (and a mild CC) like Ice W