You are correct, but it is not because of concept itself but rather because of lazy implementations. For example: Back-end renders page and something crashes

You are correct, but it is not because of concept itself but rather because of lazy implementations. For example: Back-end renders page and something crashes - you get 503 error and you know to refresh the page or contact support or w/e. Shitty web-app loads multiple components via AJAX, doesn't even check for errors, some components do not load, you have no idea what the heck is happening so all you can do is inspect the JSON response in the devtools.