Google 2016 Influence; Comparing MOZ and SearchMetrics Ranking Factor Reports

Google 2016 !!??How much influence do they have?Both the MOZ and SearchMetrics Ranking Factor reports are out.Which one is better?Plus,

Are Desktop Sites Still Necessary?
No, Says Google's John Mueller;Google Never Indexes All your Pages;
Referral Spam: what is it?

Also, Ross Dunn and John Carcutt answer a listener question onif there is any reason to have a robots.txt file on websites where we are happy for everything to be crawled and indexed?