The raid finder was an additional option for those players who had trouble finding a static or a decent group to raid with for trainings /weekly clears. If they removed those filters now, then there would be no point in using it as you could be paired with anybody and fail to achieve your purpose whatever it is (again, clear - weekly kill - training in a particolar phase).

IMHO, the RF should be kept as is, it's the players base that should learn how to use each single tool (stone sky sea > RF training > completion) and how to make progress in this type of content.