I'm on ~5 years of temp-whitelist only for JS domains. I have acquired a third sense for which CDN and assort domains are really required for what.
Sure, it does take some back and forth testing, and some sites like wix.com sites are terrible no matter what, but in general it's a better browsing experience.
My favourite are pages that embed videos using a huge collection of different third party embedding tools. It usually takes 2 or 3 rounds of whitelisting to get the video to even show up, and another to get it to play.
Sure, it does take some back and forth testing, and some sites like wix.com sites are terrible no matter what, but in general it's a better browsing experience.