You also didn't mention the fact that NG has "units" for removal too, making it sound like Invo is their only removal option, which is pretty far from the truth.
Vilgefortz - involves a chance to shoot yourself in the foot. True, this can also go your way, but good decks aren't supposed to be highrolly in their critical plays. Either way, gives some of the lost value back to your opponent, unlike Duels or bounty engines.
VVM - more expensive than duels, has smaller body and involves a status condition, too
Leo Bonhart - tall punish that doesn't do anything against defenders or patience engines
Rience requires you to pretty much build a deck around him and is pretty much unusable outside of TD
All in all, there's a good reason you don't see these guys as much. And if NG people ever go for a 2nd hard nuke, it's always Heatwave, not these cards. They're kind of bad, compared to what other factions have for these purposes.
About as far, I would say, as the statement how NG, "nowadays," don't have the points of other factions. Last time I checked, long round Assimilate could outpoint damn near anything, while having enough control to prevent that triple Gerni or Kelly cheese.
Pick one. Either have enough control to deal with Gerni, or outpoint anything in a long round. Assimilate can't really do both, because it's already a hyperpolarized deck, and if you have a Heatwave on top of Invo, you still only have two hard removals without a body - which oftentimes isn't enough, especially against MO or seeing how everything NR or SY play is a threat - while sacrificing something as important as Joachim (which, incidentally, makes your YI worse). Whereas SY or Siege could quite literally wipe your board - even the Assimilate setup, as it's ultimately all engines or payoff cards - and have a hefty brick of points after the fact.
Granted, "two hard removals" would be a lot if you could also play Diviners or Assassinations. Too bad you can't, since your provisions are tight, plus clogged Vigo is never a good time (and assass sucks anyway).
Also good of you to mention a long round specifically. Not only can you be decently matched by a bunch of archetypes there, getting that far is kinda problematic, what with half your deck being unplayable r1 and not having many good pointslam options outside of Joachim or Braathens, who are expensive, and let's be honest, you probably play Heatwave instead of the former.
And while other factions do have removal, none of it is instant, unrestricted, requiring no setup AND including graveyard hate at the same time, all for 9p. And thanks for including ST in that list, but rebukes aren't quite on the level. That big, meaty, Gord-buffing, 5-point Forest Protector can't remove anything shielded, or armored, or, you know, above 5 points of pure, unprotected meat. Anyway, in over 300 posts, this thread has said everything there is to say on the subject, and more than once.
True, but also - SC. depending on the archetype, play a bunch of bombs, CoL's and probably some more spells from the Sorcs. Lower ceiling, yes, but also can answer a lot more stuff and still probably have a heatwave. So...2 hard removals vs. 1 hard removal + a bunch of decent removal, which is generally better, except against a cheesy deck. Just remember how absolutely awful it feels to play against the precision strike - and they mainly play measely rebukes and bombs, so...
Bottom line is, Yenvo is too cheap and too good, and that's why it's probably the MOST autoinclude faction card in the game.
Wrong. That would be Amphibious Assault and Freakshow.
Whereas NG at least can't really run it in Tactical Decision and sometimes replaces it with a Heatwave instead.
But sure, it's too cheap and too good. I actually agree with this point. Stealing a 30 points Melusine shouldn't be possible. Except without such a card, the game where freaking Triple Gerni is a strategy that exists (feel free to replace with Alumni, Vamps or you know, a highly replayable 30 points Melusine), would be unplayable for NG, for the lack of other good gold options and complete lack of good damage pings/bronze removal.
Granted, pure spies are almost playable, but aren't quite there yet. Even then, it's just one inferior, slow and greedy archetype, not something you can casually throw in every deck like a Freakshow.
upd: you really should've perused Quintivarium's posts better. Here's a subjective tl;dr - yes, Invo is bad, but then what to say of the cards you're afraid to see stolen? Aren't they a little bit over-the-top if you hate to see them played against you that much?