I thought the consequences of the Thanos snap were pretty mild.
That did not happen.
I think they bypassed the plant and animal death completely. No food or supply shortages. No riots. No major problems with governmental power vaccuums.
No one on Earth questioned the explanation given by the Avengers that "Some big purple guy snapped his fingers, it's not the end of the world don't panic."
Undoing the snap without rewinding time (so you know, you don't erase Morgan Stark from existance) still leaves a ton of damage. Undoing the snap doesn't bring back the people who died because they were on a plane that crash, a bus that drove off a bridge, or they were on the operating table when their doctor disappeared.
If a young child lost all his/her adult guardians they would likely die without a surrogate parent and with the government and media hamstrung in the immediate aftermath, relatively few adults would be out seeking lost children. Babies are truly helpless.
If there were riots, murders, or wars, those deaths wouldn't come back. I guarantee there would be suicides. You know some weird doomsday cults would emerge.
The five year age differential with their loved ones would be weird for unsnapped people, especially if you are young. Imagine a 10th grader reuniting with his best friend from gradeschool, still grade school age.
In five years a lot of people would move on and get new spouses or girlfriends. There might be a baby boom as some people would want to repopulate the planet. It'd be really awkward if you come back from the re-snap and find your spouse is remarried with two kids not by you.
There is no real possibility for all's well that ends well. We basically have to ignore continuity to be able to enjoy followup movies, though I wasn't super eager to watch post-Endgame Marvel movies anyway.
. The only positive was that she only had 15 minutes of screen time
