Yes, it knew that road was inaccessible and had a different route that was longer. That's why I used Google Maps, but it ultimately lead me to the detour Apple was trying to take me.
Any sense of how long those power lines had been down? What usually makes that happen is maybe a very recent storm. Unless they were down for an extended period- maybe a construction project- I'm finding it hard to believe Apple Maps is that responsive. In my experience, AM will generally not even know about a new road for upwards of a few years after it's in use. Responsiveness measured in minutes or hours or even days seems nearly unbelievable relative to my own experiences with AM. Nevertheless, since you say so, I'll try to believe AM is that responsive now. That would be amazing if AM or Google can know such things within minutes or hours of detour-driving events. Traffic is one thing (because there's so many reporting devices) but lines down on some road won't necessarily be as readily documented.
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What is significant is that Google was default, and then was the one recommended by Apple, but Apple Maps usage steadily grew to overtake it by a long shot. The other key thing is that everybody knows about Google Maps, it's free and take a minute to download and is default on most web sites. Inaccurate mapping isn't something that people would put up with as they need to get where they are going when they need to be there, so having BILLIONS of uses a week is significant.
Speaking for myself here: Google > AM. Since AM is default, I'll sometimes gamble on it instead of going to the trouble of punching my target into GM. With the default, it's often one step. With the non-default, there's more steps. So I gamble sometimes that AM will get it right.
In your post about billions of users, I would count. If it's actually billions of uses, I would be several of those. But if I had the option, I'd default to always use GM because it generally does a better job of being right about getting me where I want to go.
I would guess that lots of GM users do the same thing- that is, gamble that the default option will work "this time."
And, sometimes it does work just fine. But not often enough for my purposes. Similarly, sometimes GM fails me (too), but not that often. On some non-scientific basis, GM seems to have better data. When getting to my destination is not urgent, I may gamble on the default. When it is urgent, I'll go to the trouble of going with the one more likely to get it right. Either can get it right or let me down for any given location. But one generally seems to outperform the other in my own experience.
Thus, I- for one- DO put up with inaccurate mapping sometimes. And I count toward those billions of uses each week. Sometimes, it gets me where I want to go. Sometimes it misses. GM does the same. But GM tends to (seem to) be right more often than AM. If I could default GM instead of AM, I would.
Lastly, AM overtook GM nearly overnight, not "steadily grew." Netscape was dominant browser and IE rapidly overtook Netscape too. Default is powerful. It doesn't make the default option better. It's just default, so it wins by being default.
If Apple decided to give up on AM and default to Waze, Waze would quickly become most used (in the billions) by Apple people. That wouldn't make it better either- just default.