> I don't think rerendering an entire webpage on the server side every time a new chat message arrives is a good idea.

Sure, but that's pretty much cherry picked whataboutism when the parent comment we're talking about said: "Most people are happy if the page loads in reasonable amount of time".

So apart from people writing chat messaging widgets for websites, do you have data to contradict the conclusions about webpage load times and rates of change of user behaviour that can be obviously drawn from the Google/Amazon/Walmart/Mozilla/Yahoo data?