My own view is no.
I think the top shots are not there by chance they have worked for it. Yes they perhaps have more basic ability but it's much more than that.
Grading would also bring on headaches for the poor sods who would have to do it. You would also have to have a set of rules for the grading.
HFT is doing O.K. and is enjoyed by many. Does it need "grading" ?