> Updates that users would not expect to see on a refresh (or a new page load)
I always hated this idea. As a user, a refresh indicates that something is happening and it's abundantly clear when something is wrong. People don't always handle errors and in all fairness they shouldn't - a developer has no way of knowing what custom stuff I have on my browser, whether I'm using any blockers or pi-holes or whatever and they should not know. Simple navigation, refreshes and server side rendering is something which worked great, the web was fast and could run on anything with a graphical output. These days a single page eats up 150+ mb while it loads. All that so the page doesn't "refresh".
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