Quite exactly.In the case of IM, it takes around two frames to misclick and thus kill yourself with great efficiency, so curse reduction won't help much. (Fade does the same thing, btw).
What I usually do is close in on an OK, since they tend to only use decrepify then. Decrep has a short duration, and isn't very dangerous, so much better.
Because they don't want a single build dominating every possible arena in the game. They might not have done the best possible job at that. But I, for one, am pretty glad that the game offers some incentive to diversify.Why Blizzarders thrown OKs in CS to eliminate the courage to do CS runs with smiter king, beats my imagination.