Google Contacts do update automatically when changes are made. This is because Google Contacts syncs with your Android device and your Google account. When you sign in to your Google account on your Android device, your contacts are automatically synced to your device. This means that any changes you make to your Google contacts will be reflected on your Android device.
One of the advantages of this automatic syncing is that it keeps your contacts backed up and up to date. So if you ever lose or replace your Android device, you can simply sign in to your Google account on the new device and your contacts will be there, just as you left them.
It’s also worth noting that if you have multiple Google accounts signed in to your Android device, contacts from all of those accounts will sync to the device. This can be useful if you have contacts stored in different Google accounts and want them all accessible in one place.
Personally, I find this automatic syncing feature to be incredibly convenient. It eliminates the need for manual backups and updates, as everything is taken care of automatically. I have had situations where I accidentally deleted a contact or made a mistake in their information, and it was reassuring to know that the changes would automatically sync across all my devices.
In terms of the technical process, when you make changes to your Google contacts, the changes are saved to your Google account. These changes are then propagated to any devices that are signed in to that account and have contact syncing enabled. This ensures that all your devices stay in sync and have the most up-to-date contact information.
To summarize, Google Contacts update automatically through the sync feature between your Google account and your Android device. This saves you time and effort by keeping your contacts backed up and up to date across all your devices. Whether you make changes on your computer or on your phone, the changes will automatically sync to all your devices.