No one in this thread has even implied either one of your two points of "conventional wisdom."
On the contrary, they have rejected your notion that the Avengers and the MCU are omnipotent, omniscient, and with no limits whatsoever on their abilities, who will beat the ID4 aliens, simply because you like the Avengers and the MCU, and hate the ID4 aliens because they're not Marvel.
Which is what all of your arguments have boiled down to. You even went as far as to imply that the aliens would be unable to gather information on MCU Earth—when RL science and tech flies in the very face of that—while the MCU heroes and organizations(S.H.I.E.L.D.) are, in your eyes, all-knowing, all-powerful, all-wise, all the time, and if that isn't clear and obvious bias, then I'll be
goddamned if I know what is.
Yes, Tony Stark's a smart dude. Nick Fury's a smart dude. Bruce Banner's a smart dude. The Avengers and S.H.I.E.L.D. have some smart and exceptionally talented people working for them. As do the X-Men and the Fantastic Four. Not to mention NYPD's Code Blue unit(if they're still a thing or even in the MCU at all). And, of course Loki, and even Spidey, if you want to throw him in.
And, the MCU side has a great deal of cool tech and powers. None of the others in this thread are discounting that.
But, what
you are deliberately discounting is these aliens aren't a race of dumbasses either. A race of dumbasses doesn't build big freaking huge ships with mass-destruction death rays capable of crossing the interstellar void at appreciable(i.e. relativistic) STL speeds and not be scoured to nothing by constant collisions with the interstellar medium.
And, their technology is equally as impressive as what MCU has to offer, if not more so.
No one is loading the dice in the aliens' favor. They're being presented as they were in the movie, with allowances made for basic science and common sense.
You, on the other hand, have been projecting your faults onto your opponents. You have been attempting to heavily load the dice in favor of the Avengers, S.H.I.E.L.D., and the other MCU heroes who are represenantive of only a fraction of MCU Earth's population and tech base.
By the way, we've only seen the ID4 aliens' forcefields repel bullets and missiles. We don't know whether those forcefields could, or could not, repel energy weapons such as the Iron man armor's repulsor beams or lightning thrown by Thor's hammer. To claim that they could do so is as baseless as claiming that the shield surrounding the Tesseract could repel the City Destroyer's energy beam. Tit for tat, boys.
They can build massive ships which can cross interstellar space at a respectible STL velocity with no appreciable ill effects from constant collision with the interstellar medium, or constant exposure to the radiation of said medium, and they
employ DEW themselves, but claiming their shields can deflect DEW as well as KEW, chemical and nuclear explosions(both of which are released energy, by the way)is baseless?!
Seriously?!
"Beware the Beast, Man, for he is the Devil's pawn. Alone amongst God's primates, he kills for sport, for lust, for greed. Yea, he will murder his brother to possess his brother's land. Let him not breed in great numbers, for he will make a desert of his home and yours. Shun him, drive him back into his jungle lair, for he is the harbinger of Death.."
—29th Scroll, 6th Verse of Ape Law
"Indelible in the hippocampus is the laughter. The uproarious laughter between the two, and their having fun at my expense.”
---Doctor Christine Blasey-Ford