[llm_nerd]

It goes the other way around. Enabling significant locations allows your device to queue up notifications like that to basically be "you have arrived" updates, versus while you are driving or otherwise engaged having a sudden notification go off, which some people find alarming. It doesn't require significant locations, but that's when it might decide to wait to tell you.

[apparent]

I have followed this issue somewhat carefully over the years and my understanding differs from yours. Can you show sources that indicate that it is the other way around? I have experienced the notification coming at home even when the phone was not set to a driving mode beforehand, so notifications would not have been silenced.