This is definitely true to an extent. However, NoScript allows you to whitelist domains, or temporarily "allow all" for a site. Sometimes it takes a little bit of trial and error, but for most sites, you can get full functionality with only first-party scripts and common CDN's (cdnjs, jsdeliver, etc).

Fat sites do break though, and I don't think there's really any way around that other than temporary whitelisting.

The Web is a lot faster for me now, though.