Because a static site generator running in a browser-container on your local machine is so much worse than using one hosted on someone else's server? Not a very useful comment.
It is. You lose the 'works anywhere' aspect of a web application, and the reasonable security policies of a modern browser executing the code in question.
One of the strengths of a static site generator is that the content part is (usually) just flat files - you can edit them in basically anything.