Faisal Iqbal and Asif given central contracts

The PCB is doing something right! It has rewarded good performances from Asif and Faisal Iqbal with central retainers. While this is a positive move, I wonder why some of the players still remain on a central contract list. It has been some time since Asim Kamal or Bazid Khan or Iftikhar Anjum or even Yasir Hameed for that matter, were considered for international selection. Not to say whether they are worthy players or not, but perhaps they should be released from central contracts?