My sister went to high school in the US for a year some time in the early nineties - we are Norwegian. She got perfect grades and some kind of award for American history. She explained it by saying, US textbooks wanted you to succeed. Whereas she was used to the Norwegian ones which were only out to rank you (on a bell curve - the grading guidelines didn't have set requirement, but instead told teachers to only give 5% the top grade), and if that meant being obtuse and reader-hostile, that was fine. If you were a really dedicated student you'd push through, right? So she thought it was ridiculously easy, but she didn't necessarily learn less.
I can't speak for the US textbooks at that level, but I can confirm that the Norwegian ones were pretty lousy, especially in history. I particularly remember they loved to hide crucial details in margin notes or image texts.
I had a minor experience with what sounds like this style of pedagogy in my high school physics and calculus courses. The lecture and grading styles effectively pitted students against one another. I suppose this works for confident and competitive students, particularly if you can get in the instructor's good graces, but I was merely curious and dealing with self-esteem issues (physical late/never bloomer) and stereotype threat. I continued excelling in my other classes and just switched off in those.
Without getting too into the weeds, I did a lot better in classes where the teacher was some category of "votes blue", identity-wise (race, gender, sexuality, even height).
Always interesting to revisit the idea of the theoretical role “education” plays in society. One might view the primary objective of school as a sorting machine or one that imparts knowledge for its own sake. These two things aren’t specifically mutually exclusive, but you can have only one “primary objective”.
Only having experience within the US myself, I have always found the idea of “forced ranking” for grades a little odd. Though admittedly, I do skew towards being (perhaps a bit too) idealistic in that sense.
The U.S. textbooks are so much better than textbooks in many other countries. They are thick and heavy, but then that is because they tend to explain the same concept in multiple different ways so students with different thinking modes can find their own explanation that clicks.
Furthermore, having good textbooks papers over the fact that in the U.S. the qualification and ability of teachers vary so much across poorer and richer school districts. A smart student in a poor school district can use the textbooks to a greater advantage.