I agree with Errol.
poetryandwine in part does this come from schooling and the fixation with grades. Outputs rather than outcomes.
I assume the outcome parents, educators, employers and society want are resilient, rounded, inquisitive, self-motivating, educated young people with critical thinking skills and good judgement. US Universities, or at least the very competitive ones, tend to recruit on the wider basis of what a young person will bring to the community as much as what there individual potential is. Outputs are things like A level grades and degree classifications.
I am often surprised when posters whose DC sound like credible Oxbridge applicants are advised, often by posters claiming to be teachers "only take three A levels and get better grades". Strong STEM kids ought to be able to at least start FM, if their school allows them to. Ditto when posters says their child gave up the chance of being a prefect or similar because grades are more important. OK if it is a real choice between one and the other, but if both can be achieved, why not.
In her first year DD and a friend were left to complete a group project designed for 9 people and due to be delivered just before the summer exams. Though it was massively unfair, the others had decided to focus on exam revision to maximise their individual marks so there was little they could do. The project needed to be done. Its fine. DD's colleague will probably be a life long friend. DD has the learning from that project and she has learnt about time management, focussing on what is required of her rather than worrying about others, and so on. Her tips for group work are ensuring individual contributions are defined at an early stage, then get your bit done is good time so you are available to help with last minute panics. The points system used to allocate places for medical students is now little better than a random number generator, but her tutor has reassured her that once she starts work, wherever that is, she will be fine. That, I suspect, will be true more widely. The student who has real world achievements on their CV (running a society or something) may look more attractive to employers than someone very focussed on maximising individual grades, and adapt better to the work environment.
All a bit off topic. I assume lockdown has made things worse.
Imperial was using an interesting range of approaches to test students. Someone I know who teaches there says her department have moved away from traditional end of year exams altogether. Another friend is a computer games designer, originally from eastern Europe, and he was impressed. In his industry and similar ones, collaboration is key and is international. His own University's approach had been rigid, and old fashioned. Education needed to keep up with the demands of the modern workplace.