Correct. The 2-Piece applies to everything in the Tactics category.
That’s actually pretty much the intention, though less Tom and Jerry and more Predator. 
Sometimes, we like experimenting with a different approach to game play so that every set isn’t just “do more damage.” Fear is a potentially interesting, but underutilized, mechanic and actually has a lot of currently unused synergy among items and other classes (particularly Witch Doctor). Independently, I’ve been theorizing around a build that capitalizes off of working with a zDPS Witch Doctor, which we haven’t seen much of for a long time, and I’m looking forward to seeing if it plays out.
We’re trying something different and outside the box. It’s almost certainly going to need some work (most of our new stuff does). This is exactly why we have PTR, and we’d like to see what people come up with during the testing period. Personally, I see the fantasy in playing a terrifying, feral warrior that enemies flee from, and there’s definitely some tools available to make herding fleeing foes a play style or mini-game of sorts. How and if that plays out long-term will take a little experimenting and observation, and we hope you give it a go and let us know your thoughts!