Comment by jeroenhd

Google has APIs to do the same. In fact, it works on most apps. The biggest exceptions are security sensitive apps (2FA, password managers) and WhatsApp for some stupid reason. If you're a HN Android user who turns off any form of data sharing like me, you wouldn't notice, though, as this requires the "back up my data" checkbox during setup of the old and new phone to work conpletely.

Another issue on Android is that iOS allows for syncing data through the user's iCloud, which can be gigabytes in size, but Google has you use the Google Drive API which sucks and involves handing over credit card info.

The Android file transfer has another trick that Apple doesn't seem to do, which is fully offline local sync rather than going through the cloud. This has reliability issues and requires both devices to stay on and nearby while the transfer is in progress, but on slower internet connections the process can be a heck of a lot faster thanks to modern wifi speeds.