Good lord, at this point just drone off in front of a Netflix show. How bad has it gotten that you even suggest that one can "forget what happened chapters earlier" ? This is not normal.
This is hardly that strange, life gets in the way for many of us. I too have many times wished for an easy way to recap a book I've had to put down for a week or two - this is by no means an endorsement of how Amazon have done it here, but you are making incredibly arrogant assumptions about how others enjoy books.
I'm an avid reader. I'm reading The Silmarillion right now. There have been countless times where a short summary of an area/character/etc has been helpful. Luckily, in this particular case, there are very good Tolkien fan dictionaries that serve well.
As another example, I read the Aubrey-Maturin series earlier this year. Many times I would have liked a quick summary of a previous voyage or of a political plotline or something.
If you have ample free time and few commitments and/or you read very short pop fiction, I could see how you might believe this. But there's a vast world of very long and dense literature, and also...people have kids and a life that gets in the way. Combine the two and...well, I can see why this feature would be useful. :)
Even Pynchon's lightest work yet, the newly released Shadow Ticket, has me immediately reading it a 2nd time for many details I missed the first time through. Imagine the arrogance of shaming a Pynchon reader assuming they should never need to check notes or refer back to earlier pages.
It's more telling about the current state of affairs than the person who commented. Forgetting things is part of life, move on, we don't need daddy bezos sucking 1.21 gigawatts per request to tell you that some side character drunk a beer 12 chapters ago so you can enjoy the joke you just missed.
