I don’t understand why doing things the non-JavaScript way wouldn’t be correct. Surely you still need to do all the correctness things on the server anyway even if you do some in JS because client side validation won’t stop other people (or spammers) from sending invalid requests to the server. When I think of a correctness problem it would be in keeping the js-rendered comment section synchronised with the server-side comment section which seems harder than making it work with no js.