And now the disadvantages (Score 1)

While the advantages are significant, let's not forget about the disadvantages:
* There will be fewer browser add-ons which extend the functionality of a website, as it will be a lot harder to figure out how the code works.
* It will no longer be possible to inspect the JavaScript-code to see how it works and learn from it.
* It will no longer be possible to inspect the JavaScript-code to look for security problems.
* It will no longer be possible to inspect the JavaScript-code for abuse of your privacy.
* It will be easier for malicious sites to run undesirable code in your browser undetected. (Such as Bitcoin miners.)