The missing resolution to the Thanos Problem

Rating: 8/10 (6 May 2019)

Warning: Spoilers ahead!
I have two major criticisms about Avengers Endgame that I call the "Thanos Problem". These are:
1) In Infinity War, a very serious question was asked: what should be done about overpopulation and the increasing fight for limited resources? Thanos's answer was to wipe out half of all sentient life. It is very easy to see on how many different levels this answer is flawed. In this movie, Avengers Endgame, the heroes had their own opportunity, after acquiring all the infinity stones again to address this problem in a more constructive way. It was possible for them to literally do ANYTHING they wanted to make the world a better place. With just a snap of their fingers, they could have eradicated poverty and diseases, yet they did nothing with this power. Even if that is too much, they still could have started to change the world for the better, before for example the stones would power down, and show us how much good they did. It could have been so uplifting. But no, they need to bring the stones back right away where each of them belonged.
2) My other major criticism is about the character of Thanos. In Infinity War, we saw a unique villain, who had emotions and was a much more complex villain than what we usually get. In this film, Endgame, we don't see the emotional side of Thanos at all, he is reverted back to the usual one-dimensional villain. They could have explored the human side of his character a bit more for example his relationship with his daughter. If they really wanted to bring back a dead character, why not bring back Gamora, which would allow this rediscovery of Thanos's human side to evolve? She could have been teleported out before dying by the mysterious force that required a sacrifice for exchange of the Soul Stone. Then, linking up with the Avengers, they could have devised a plan to find Thanos, and convince him that what he did to the world was wrong. This could have been done by exploiting his love for his daughter, and making him see that he took away the daughters and sons of so many, who all suffer, just as he did when he lost Gamora. After realizing this, he would correct his thinking and restore everyone thus providing a substantial character development to him and give him the proper ending he deserved (as opposed to being beheaded by Thor while unarmed).
The humor and visual effects are excellent, but I was expecting more from the story and buildup of the previous film.