Even the current system doesn't fare well for those DC's on the C/D borderline.
Drop two marks, you get a 'D', employers rubbish the qualification you worked your socks off for.
Yet the school won't allow you to do vocational qualifications because they assume that your hard work will get you that 'C' without them putting anything extra in.
Then grade boundaries are changed and there's no chance of you getting that 'C' that you were predicted when the school told you to take 'traditional GCSE's'.
And they didn't have a suitable vocational program anyway...
And in some subjects, with the best will in the world, some DC's just WON'T get a grade higher than a 'G'.
My DD is working her socks off, doing practice every night, and she's just managing to get a mid-G prediction at this point in Y10 in Maths.
She has finally retained the majority of her times tables, except 6,7 and 8, despite daily practice from the age of 6yo. Eight years daily practice and she STILL can't get the last 3 to 'stick'.
What's your suggestion for her? She can use scales, a jug, a sugar thermometer and a calculator. What more does she need to work in a patisserie or a bakery?