> I don’t care if setting up a static site generator takes more time or is harder or whatever, I only see the output, which is obviously better in one case.

Don't these static site generators serve the scripts that you do not like? On a statically-generated site, the dynamism of the site is in the script and is evaluated in your browser. On a non-static site, the server does the evaluation, so your browser does not have to run as many scripts for the same level of dynamism.