1.) Overall this is a dice game theres never a guarantee for a 2 to 1 swing with anyone
2.) The 2 for 1 swing idea is why I build against Tachyon with Hazards/ Tanks. With a Legacy with heroic interception and danger sense/ Truth on the team this hyper turn could turn out as nothing but 3 damage on Tachyon… maybe a death on Truth. … and I then just ignore until she decides to incap herself to try to hyper turn again/ we need to kill her. With a turret/champion on Unity you can discourage her to even get close… The same idea with a Hidden Blade Strike with Operative. With a Operative in dragons frenzy you could very easily ignore her damage with 5 defense die. A Bunker with 4 defense die could also reasonably withstand her hyper turn.
The idea that you can counter her hyper turn with strong characters fairly easily is why I think she is not deserving of a higher tier spot, her counterers deserve that spot.
By no means do I think that Tachyon is weak I just dont think she’s the unstoppable beast this thread kind of makes her out to be. (That’s Dawn or Bunker currently in my humble opinion)