...geez, no kidding. That would be nice.
Especially considering that service's first troubleshooting step is often: "Let's do a factory reset".
Oh well, It is certainly a pain, but only needs done every year or two.
Actually, there's a way (at least on the 520) to export all your settings and then import them back after the factory reset. Last time I did a reset Garmin support told me about this hidden feature. Not sure if you can export from 520 and then import into 530/830, the config file would need to be backwards compatible.
This has really been a PITA with Garmin for years, despite many complaints. Much easier to configure the device online (e.g. suunto) or smartphone (wahoo), or better yet on all three.