New changes to 670-1 on tattoo policy and off duty attire. Thoughts?

From what I have gathered regarding the tattoo policy, only 4 (size of your hand) tattoos are permitted below the elbow or knee. People with more or sleeves will(?) be grandfathered in. On that note, I do not understand as to why the new policy is needed. I understand and agree with no face, neck, or hand tattoos; as they do look unprofessional and are visible in ACUs and ASUs. To further the topic, I believe tattoos, to include sleeves, are a part of military heritage and tradition. Any other insight on this or furthered opinions?