2) Links no longer point to your own website.
3) Analytics don't work correctly, because the wrong URLs are logged.
4) It centralizes the WWW on Google's domain, keeping users on google.com rather sending them deeper into your site.
5) It restricts the way that you can monetize your site.
6) It causes webpages to load slower when 3rd party scripts are disabled.
7) It restricts how you can build your site.
8) It isn't faster than hand-optimized HTML.
9) Etc.
Even if nothing else, people should oppose it because centralization is exactly what the WWW isn't supposed to be.
2) Links no longer point to your own website.
3) Analytics don't work correctly, because the wrong URLs are logged.
4) It centralizes the WWW on Google's domain, keeping users on google.com rather sending them deeper into your site.
5) It restricts the way that you can monetize your site.
6) It causes webpages to load slower when 3rd party scripts are disabled.
7) It restricts how you can build your site.
8) It isn't faster than hand-optimized HTML.
9) Etc.
Even if nothing else, people should oppose it because centralization is exactly what the WWW isn't supposed to be.