Hopeling

OK, I've tested it:

As you can see, there are two ticks of Reactive doing 14.85, then I hit Nightstar with an attack and the -res procced, then Reactive starts ticking for 15.22, 2.5% more than it did before.
I've never heard of the procs being intended to be unaffected by damage resistance or resistance debuffs. In fact, their being affected by resistance was explicitly why Degenerative and Cognitive got weaker DoTs than the others, according to Arbiter Hawk in the beta feedback thread - because (the devs think that) those damage types are more valuable because they bypass many enemy resists.

Yes, that is true.

Not to say it's unplayable, mind you - for example, as Werner has long since proven, Katana pairs well with Regen, partly thanks to defense from Divine Avalanche. But hypothetically, a non-weapon set that was otherwise identical would pair even better.

I haven't played TW/Regen, or any /Regen much at all for that matter, but being locked into a long non-Momentum animation when you need to heal seems potentially risky. On the other hand, you're totally right that the multiple AoE knockdowns should be great.

He isn't, obviously. That's why it was not the first question which spawned the indignation, but the subsequent insult/demand combo.

Yes, but the recharge is also twice as long, so the uptime is the same. One FE does save you ~1.7 seconds of activation compared to two Build Ups, though.

Moreover, getting an everlasting bonus to damage, health, and regeneration (albeit a small one) basically just for playing a villain would be silly.

That's an interesting question. We know very little of them so far, but I like to think of them like the Tyranids in Warhammer 40k, who aren't literally running from anything so much as racing against hunger. After all, when your next meal is light-years away, it's best not to dawdle after you've stripped the current prey clean. Or perhaps like Gah Lak Tus from the Ultimate Marvel universe, which hates organic life the way people are repulsed by bugs, and cracks open planets to harvest the heat from their cores to power its next voyage.

Even letting it give an Empyrean merit might not be overboard, subject to a timer of course, perhaps even a longer timer than the large trials. The current trials give both emps and a reward table, after all. The majority of the rares and VRs I've ever obtained have come from reward tables, not crafting from merits.

I didn't see anywhere that Deus said it was unjust for Brutes to do less damage than Scrappers. He simply stated the fact that they did, as they should to compensate for their improved toughness and aggro capabilities. And if they're already where they should be, why do they need to get a dud ATO proc?

/Inv is a great set, top-tier for survivability. Whatever it was six years ago is irrelevant. Moreover, even if you disagree with why people might want it, the apparent popularity of Invulnerability builds both on the forums and in-game says that people clearly do want it.

The various EATs have access to ranged attacks with a wide variety of damage types (lethal, energy, negative, toxic, psi), robust defenses, team buffs, debuffs, controls, and pets. What limitations precisely are you referring to?

Although several responses seem to regard turning the blaster into a ranged scrapper, I thought the OP was talking about a hypothetical new AT with a blast primary and defense secondary. Such an AT might not do Blaster damage, but the abilities of the EATs suggests they would not need to be far behind.