I think this is probably the worst affix design wise currently in the game. There's no "playing around it" as a Havoc DH, it literally just requires you to do nothing for a long time on trash pulls. You need some form of misdirect currently to avoid pulling threat, which isn't a problem for most other classes in the game. The closest equivalent to us is a rogue which has threat reduction and tricks so never has an issue with this affix.
Havoc wasn't around when threat was relevant, which is why I suspect it has no answer for this.
Blizzard either needs to give Havoc some form of threat management like rogues have or drastically reduce the threat that CS/Annihilation generate. Here's how a typical pull of 4-5 mobs goes in a Skittish dungeon:
1. Wait about 10 seconds to engage.
2. Pop FOTI, glaives, EB, Death Sweep, then fel rush x2 if there are enough targets (or save to save your life when you pull threat)
3. Tab target Annihilation spam because more than 1 on a single target instantly rips threat
4. Anxiously pop Blur, instead of saving it for relevant mechanics
5. Get a few good high crits, pull threat on 2-3 targets, get instantly 1-shot on 20+ keys, or take a hit and run away
6. Return to the pack, start hitting the next target and hope you don't rip threat on that one
It's stupid. It's not "bad tank" either. 935+ geared tanks, even bears short of popping incarn all lose threat to a well geared Havoc. It's not as much of an issue on bosses, but I definitely can't even pug or help with low keys because doing 2+ million DPS to a single target (and 1+ to all other targets) generally rips threat on anyone but a very competent tank. And "low geared" tanks at 910 if they miss even a couple of GCDs on bosses, I pull those too.
Blizzard design in 2017, perhaps the biggest meme of them all. At least this means we can reliably Havoc tank on easy content.