The manufacturer has no incentive to update the OS, it’s not just a matter of loading the new version of Android. After the phone has lived it’s normal course of life, the software just gets abandoned, if they even pushed out any updates at all.
Sometimes the enthusiast community steps in. Either to extend the life of phones, to flex that a project can be done, or for other purposes. Like so https://www.xda-developers.com/samsung-galaxy-s-ii-android-12-custom-rom/
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