That link nailed me perfectly. I'm on my phone. Connected to wifi, like most people probably are. Chilling in bed or on the toilet.

If you're on cell service.. yeah probably less accurate. Not sure if it makes the form harder to fill out if you have to change some of the fields.

What I've started doing for my personal app though is I've added a "guess" button. It fills in the form using heuristics but it's opt in. Fills out like 10 fields automatically and I've tuned it so it's usually right, and when it isn't correcting a few is still quicker.