TBH, I have considered writing a version (this isn't my work at all, yet) that does submit the blathering server-side so it looks like there is a useful round trip, but:
* I have more important projects awaiting the much fabled arrival of Free Time!
* While it could potentially keep an idiot “happy” longer, I'd have to mess around with some sort of login system to give the right people the right comments back, it couldn't rely on a just session ID as that would be as volatile as the comments in local storage.
* Taking in the data gives the possibility of DoS by extra routes.
* Giving back the data gives the possibility of the comments being abused as a Heath-Robinson-esk storage device!