Sometimes I can understand a lot of the criticisms. Sometimes its just nitpicking as "Not the same".
Heres a perfect example. They dont like the gestation period of the face hugger to birth. And they bring up the chick in the wall in Aliens and say "Hey, shes been there for awhile!".
But heres the thing. Kanes period wasnt very long once he woke up to having the thing burst out of him. Maybe it wasnt 5 minutes, but it also didnt seem like 5 hours either.
Meanwhile, this chick had to have been on that wall for DAYS or close to it (remember, Newt has been there alone for longer than 17 days), and they dont complain that "Hey! How come the gestation took so much longer in Aliens than in Alien?". They even say "The first movie to fuck with this stuff is AvP", and its like, no, dude. Aliens fucked with it. But they dont complain about that.
And the thing is, its pretty easy to chalk it up to "It doesnt always happen in the same amount of time". Maybe getting pumped full of adrenaline can increase the efficiency of the growth cycle. But who cares? Its the kind of thing you do when you're just looking to spot differences rather than accept possibilities.
As far as I go "not the same" isn't necessarily a bad thing. If it's fair, not a cheat, isn't monumentally stupid, and it makes sense within the world that's been established, then it's fine. I can't recall a time I've ever been upset with something
purely because it was different. The Texas Chainsaw Massacre 2 is
super far away from what 1 is but 2 is my favorite of that whole franichse. Halloween III is not even in the
same universe as Halloween 1 (literally) and I adore that one. So saying "you just don't like it/are nitpicking it/won't accept possibilities
because it's different" is an easy way to dismiss someone who has criticism. Possibilities, changes, whatever you want to call it, are fine as long as it's done intelligently and it doesn't totally obliterate the rules.
With Alien, we only get a very tiny glimpse of the gestation process, so when they expand it a bit in Aliens, it's not that big of a deal. It still feels fair. But when you're 4 movies deep, spread across like 300 years, and things have basically been established within certain parameters, and then you make a film
within that timeframe and randomly jump
outside of those parameters, it feels like a cheat. Just like the gestation in AvP was ridiculously fast and clearly a cheat. (Done without an ounce of suspense to move the plot along). We don't know exactly WHEN the chick in Aliens was impregnanted, so we can't say for sure the movie really changed anything. It doesn't feel like it's broken any rules.
Like Alien Isolation. All we really heard of Amanda Ripley prior to the game was that she was Ellen's daughter and died sometime before Aliens. That's it. Finding out that she went through
her own ordeal with xenos is certainly a big expansion of what's been established, but it's not a cheat. It's fair. Therefore there's nothing to be upset about. Because it didn't break any rules. So you see, adding to the lore and expanding the possibilities is fine as long as you don't completely fuck the rules in the process.
Another thing, as the video mentioned, it's been established that it's
impossible to remove a facehugger and still keep the host alive.
Medical Personnel/Scientists/AI Cyborgs couldn't do it 30 years in the future in Aliens, or 230 years into the future in AR, but all of a sudden in a movie that takes place
between Alien and Aliens, a bunch of high school-looking rando kids figure out how to do it no problem???? It's another bullshit cheat.
(As for your suggestion about being pumped full of adrenaline and maybe it speeds the process along..... I'm pretty sure everyone who was awake and had a facehugger jump onto them was maxed out with adrenaline. It doesn't exactly seem like the type of thing that someone would take calmly)