Samsung has come in for plenty of criticism about its software update policies. With the Galaxy S8 and Note 8 unlikely to ever receive Android 10, it has now emerged that the company may be bringing One UI 2.1 to devices as far back as the Galaxy S9 and Note 9. While not strictly a third OS upgrade, it would be a volte-face for Samsung.
https://www.notebookcheck.net/Samsung-prompts-speculation-that-it-could-be-bringing-a-third-OS-upgrade-to-the-Galaxy-S9-and-Note-9.457417.0.html
Well it is completely logical since the s8 and note 8 did not come with treble support. The 9 series did, cause you can flash a stock google rom without unlocking the bootloader