Absolutely, we DO need complete a complete update image.
Edit: One issue with an update image is, they would have to update it every time they release any patch or new version. Phones that comply with googles’ “Android Verified Boot” do not allow downgrades of the system, only upgrades. If you install any update, going back to the old version is impossible once the new version booted once, as the bootloader will remember that. So even with a full image available, you could only install it, if its the same or a newer version than what you have on the phone, not an older one. Android Verified Boot 2.0
Booting an older version is only possible if the phone/bootloader has been unlocked.
That being said, I think your problem can be fixed using adb, as the app is still in /system, just “not installed for user 0”. Try
adb shell pm install --user 0 /system/priv-app/GoogleServicesFramework/GoogleServicesFramework.apk
this should work for any apps that have been removed using
adb shell pm uninstall --user 0
as suggested in