Do nofollow and ******** links even mater anymore 2017

I am wondering if nofollow and do follow link really mater in regards to DA(domain authority).

I heard somewhere that they dont really make a difference. Is there any proof that adding a bunch of do follow links to your site will hurt your DA anymore then a bunch of Nofollow links?

I have recently had a request for a article to be posted on my site with a do "follow" link. Not sure how to address this. I usually post "nofollow" for guest posts.