Up until a couple of years ago, even Samsung flagship smartphones only received two major Android OS upgrades and three years of security updates. The company now provides the best software support of any Android OEM. Many devices now receive four Android OS upgrades and five years of security updates.
More discontinued devices to get the update
We've seen Samsung do this in the past. When there's an important update that needs to be sent out, it will update even those devices that are well beyond their software support deadline. That's why the Galaxy S7 and Galaxy S8 are now receiving this update.
The Galaxy S7 and Galaxy S7 edge are receiving an update today with firmware version G93xFXXU8EVG3. These handsets were last updated back in November 2020 when they hit their deadline. The Galaxy S8 series is also receiving an update with the firmware version G95xFXXUCDVG4 after the last official update was released back in April 2021.
Both of these updates bring a GPS fix. Evidently this issue was important enough to require a new update for discontinued devices. Samsung has already released a similar GPS fix update for the Galaxy J7, a device that came out seven years ago in 2015.
As GalaxyClub notes, Samsung seems to be preparing similar updates for more older models, including the 2015 flagship Galaxy S6 series as well as the Galaxy S9. There may be many units still in use which is why Samsung feels compelled to address this GPS issue on such old devices.
Unfortunately, none of these updates will bring the latest security patch, so those who are holding on these devices should seriously consider an upgrade now.