I block third-party Javascript quite aggressively (for fear of malware). I am much less strict for first-party JS. If this becomes the norm I'd block first-part

I block third-party Javascript quite aggressively (for fear of malware). I am much less strict for first-party JS. If this becomes the norm I'd block first-party just like third-party. As well, obviously the owner of the website becomes directly responsible for malware served through an ad network. Finally, advertisers prefer third-party to fight ad fraud (by the site owner).