The last two thousand years of the film have been criticized. Sharp critics even said that Spielberg gilded lilies and turned a profound story into a film full of warmth.

But according to the information I have seen, this is not right. What Spielberg changed was that David finally woke up to see his mother disappear until he fell asleep. The general context of the story is still running according to Kubrick's setting.

So why set such an ending? Is it for promiscuity?

Of course not, behind the warmth, Kubrick's coldness still soaked all this.

Let's take a brief look at the story at the end: after 2000, the earth was frozen and human beings became extinct. Mysterious visitors rescued David from the ice in Manhattan. Out of curiosity about human feelings, they granted David's wish and brought Monica back to life for one day. Mother and son spent a wonderful day together, and then Monica went to sleep forever. David is either awake or asleep, and the story is over.