> Did you also have to tell your users to press Ctrl+F5 to get the updated assets?

Actually I did!

What I do now is this: there is a websocket connection always open with the connected browsers, and when there are some assets that reallyreallyreally should be refreshed, I send a command though the websocket and the browser (after a few client side checks, like making sure the user is not in the middle of filling out a form) executes ´window.location.reload(true);´

What is there a better way??!

Assuming your are not just joking, the keyword to look for is "cache busting"

Hehe I was joking. Really enjoying the cache busting functionality in webpack :)