The current system isn't coping well with COVID-19 but let's not throw the baby out with the bathwater here.
The current system is simple, and that means it can be seen to be fair. If studying X at university Y needs grades AAB that's easy to understand and you know it's not biased.
I much prefer that to the American system where every university has an opaque system that purports to look at a complete picture of the student then mysteriously picks white students over Asian students with better grades and can't explain why.