French GCSE sounds like a joke. Anyone with a decent memory could pass it
To be honest, I think in some ways that applies to science as well, and to some of the old O levels.
With French the 60% CA you prep in advance and learn and spout. But you do still need to do the prep (unless you have a tutor or parent who 'helps' too much). It is also of course easier to learn stuff you actually understand. You also have to be able to understand written and spoken French for the exam, so you do need to know some vocab and grammar.
However I do agree that critically, you can do well without being able to hold a random conversation or write a correct short note, which is draft.
I am currently helping DD1 revise for her Science GCSEs. It is possible to pass them by just learning the facts, even if your deeper understanding is very shaky. Indeed, there are certain concepts she really struggles with, but at this point she is going with 'OK, that's what I need to say'.
With the old O level English Lit, I think we had to do much less detailed analysis of the texts that DD is having to do. Because it was closed book, you had to know the plot and some quotes, but you didn't have to pick it all apart.
The old history O level was very much spouting facts iirc. The GCSE emphasis on analysing sources, and considering bias and accuracy within a context of also knowing facts, is I think much better.
I like the 2 tier foundation & higher within the same qualification. You teach the same syllabus (which was not done so much for O level and CSE I believe), at the rate the students understand it, and you can make a late decision (a few weeks before) on whether to enter the Higher or Foundation paper, rather than deciding at the start of y10.
BTEC is different because of the very different way of assessing it.