This will be likely be because this 2016 device did not receive a Samsung Firmware revision since you did your first install of /e/OS,
So your S7 probably already had “final and latest” Samsung firmware so you had no out of date vendor parts to consider for any of your future upgrades.
This is an important factor for all of us considering Upgrade of /e/OS; to check has “the date of the final and latest revision” already passed for one’s device. Most manufactures are quite unlikely to upgrade firmware after 2 to 3 years, but one needs to check.
Once /e/OS is installed the significant date, Vendor Security Patch Level (manufacturers may use further different terms eg Baseband version), can be found in Settings > About phone > Android version.