Sure they can still be done, just not Black Flame Chaos/Vitality AAR with the Red Beam of Death from the Transmuter. It’s a build now. But we can’t say that on the forums.
Yes there was a thread from a month ago with the top20 crew (and yourself) complaining about the SR performance of Chaos FoI and how Tainted Flame (with Tainted Power thrown in) is a “relic of the past”. And how AA, FoI and AAR are “gimped” because of how enemies stack up (again, in SR + CR, not campaign or when leveling really because Campaign or leveling is not their thing) despite videos posted in other threads showing the build in question evading/movement rune into the middle of packs or not using terrain to the build’s advantage (or disadvantage of FoI’s “limited cone”).
And it turns out the Tainted Flame change wasn’t responsible for much afterall. The other changes Z made with added damage, increased cone size and turn speed had a much larger impact as shown here:
build now. But 
we can’t say that on the forums. 
