The super speed powers aren't as vital as people seem to think. In a lot of cases... using your actual powers to clip weapon combos will compete with Dervish and Vortex. Phase dodge is super handy and hard to replace, but not using it isn't going to hurt your dps by nearly as much as leaving Robot Sidekick behind would. Tornado pull can usually be replaced by a hard hitting DoT for single target if need be. The best part of superspeed is the ability to dash across the map in combat. All the other tools are just sprinkles on top.