I've never liked that feature. You save a page to a PDF and it gets stuck in this permanent mix of blue and purple links.

I've never needed my browser to tell me what I have and haven't visited. Especially since I use different browsers on different devices, so it's never even accurate anyways.

true, however when we moved out to javascript, this rarely make sense (I mean in the percentage, but the content-related links should be restyled on :visited pseudo class)