As an "old school" EM fan and someone who is not a huge number cruncher, doesn't necessarily hunt for "optimal" attack chains, and has never punched a pylon outside of an MSR for any reason, here's my $.02 on the "feel" of the set revamp after some playtime as a Elec/EM tank copied directly from Live (incarnate, but not purpled) and a new EM/Nin Scrapper (purpled, but no incarnates)
Overall, the set feels...fine. Certainly a vast improvement on the current state of EM on HC/Live. The new TF is amazing. Didn't really notice a huge difference in BS, EP or WH. I'm a fan of Power Crash, and find myself using it to thin bigger groups, even in lieu of a fast ET.
I also don't mind the Focus mechanic as much as I thought I might. The fact that it gives me back my old friend fast ET, well, tyvm! Would I rather have it back 100% of the time? Sure. But I'm happy to have it back at all, and the improvement to TF makes the TF > fET combo pretty much 100% anyway, at least to the point I've accidentally killed myself spamming fast ETs in big groups several times while not paying attention to my own health.
That being said, I have only one minor criticism when it comes to the double Focus mechanic on Scrappers and Stalkers...
I'd like to second this. There's nothing "wrong" with Focused BS, per se, there's simply no use case for it on a Scrapper or Stalker. There is no scenario where it is a preferred option over another fast ET or a Power Crash, and it actually feels a little weird, and a bit punitive, to have to actively *avoid* using it when you have a 2nd stored Focus. It's not the end of the world, but it does require changing up your attack chain on the fly so as not to "waste" the 2nd Focus.
Even on a Tank, aside from leveling, I don't really see Focused BS as terribly desirable, or useful, either. Maybe the -regen comes in handy in a prolonged AV or Monster fight? I guess that's the one scenario I haven't really tested yet. But the set stuns enough on its own that a 100% guaranteed stun isn't much of an incentive to use Focused BS as a one-off. Fast ET and wide PC seem to always be better options.
It's a minor thing, but maybe an opportunity for some fine(r) tuning.