[strogonoff]

Engineers have vastly different definitions of “well-functioning” and “easy”. Once I saw an app that used accelerometer API to determine in real-time whether the user is walking. It was done as a web app (native was considered too difficult) and the data was sent to GCP for processing. Even without the GCP code, which involved a custom ML model, it was in the hundreds of LoC. I don’t know how well it would function in real use, since it did not really reach mass production, but I do know it is possible to do completely on-device with very little bespoke logic and a very small LoC count on iOS (and I’m sure on Android) where APIs would give you exactly that (and even movement speed, if needed).