> Most chromium-based browsers will show a big scary and permanent button if they can't update, for example.

Vivaldi which I use thankfully doesn't do that. At least on macOS it uses the common Sparkle updater, which would pop up a window in your face when you least expect it telling you that an update is available, showing a changelog and letting you decide when and whether to install it.

Even though it is an interruption, it's still much more respectful than what Chrome does. It insists on running a background service at all times and the only way I was able to neutralize it was to delete its .plist file and create a directory with the same name.