I was going to comment that this device is likely stuck with an old LTS kernel that won't be supported by Android 5 years from now, but then I found that Fairphone has been doing heroic work to mainline kernel support for their hardware: https://www.phoronix.com/news/Fairphone-4-Linux-Patches
@codewiz@peterk@janci in the meantime I received September security update before stock. I mean at this point, if you care about security and privacy, there is no other choice than #GrapheneOS.