That humanity couldn't get past their fate is telling. That the Avengers, even Natalia, couldn't - is telling. I admired Natalia until she became...normal.
Hulk has gotten smarts many times. The Freud in everyone needs the angst to emerge and take hold - eventually followed by some repose.
Thor's line made sense - and you know a woman needs to be in charge today - with which I have no argument. Thor is exploring himself, and seeking new and varied experience. Hail.
Time travel in sci-fi tends to be stupid, except when it's a farce/comedy like Back to the Future. Maybe Hot Tub Time Machine. I haven't seen it.
On the Infinity Stones: you can't destroy them by using them. The Stones are the ethereal elements of the universe (um, what about the Cosmos?...were Celestials affected?...and so on). They'd just disappear back to wherever they'd want to be, you know, to be used again.
Stark's gauntlet was forged through his spirit, with high-end tech. Hulk could handle it because of his massive, um, personality (it wasn't the radiation, but the magnitude of power of the Stones that scarred him, and hence mutated his flesh to delay healing). Ditto, almost, Stark.
Making Spidey a teenager in today's world was predictable (and how did that happen?...in the high school lab???), AND the LA-MEST. Except for The Breakfast Club, Sixteen Candles, and Pretty in Pink I didn't give a ---fudgesicle--- about teenager ---steaming pile of meadow muffin--- when I WAS A TEENAGER.
That said, I think the decent Marvel movie of the lot was Into the Spider-verse. It was only slightly teeny and stupid, and the story line made sense. (Of course, the main characters being black ensured a less stupid storyline.) I enjoyed some of it.
Other issues:nobody in the MCU explores their abilities with a shred of sensibility. (Black Widow and Hawkeye have no abilities beyond the normative. They would have gotten swatted aside when they attacked Bucky.....) The scientists don't act like scientists*. They act like children who think they know better.
In another vein, half-way through Far From Home I was beginning to think the writers, and at least Gyllenhahl (whose performance was superficial - though the character was ridiculously hyperbolic in the fashion of today's psychobabble writing) were saying 'this ---steaming pile of meadow muffin--- is ridiculous, you fools', which is underlined by Mysterio's dying words: people will believe anything......
They need to go back to adult characters to have a decent story - but that won't happen, because kids rule the entertainment world. If the world goes to hell, they're gonna need us. Or maybe we'll eat them.
*
https://youtu.be/dWyITeq4pzM?t=338