Limit on SPM subjects

DPM said yesterday government might limit the number of subjects taken by student in the SPM for fairer PSD scholarship selection. I am very stupid, can somebody tell me why by limiting all the student to take only 9 subjects or less can make PSD scholarship award fairer. To me, if the Government considered students with 7A1 should be given scholarship, then all students with 7A1 and above be given the scholarships, simple only. If there are other factors, make them known to everybody, be transparent. Of course other than this NEP has to be taken into consideration, nobody is questioning NEP.