Long term support is nice but downgrades should also be allowed when one cannot afford to purchase a new one so they will have to go back to a version optimized for the device, it does not matter whether it's Apple, Google, Samsung, etc
Force apple to re-sign at least the last update of the version [iOS 11.4.1, iOS 13.7, etc] and force android manufacturers to stop their downgrade lock... Samsung prevents downgrade once your device is on a certain build/security patch...
Allow users to downgrade to the version designed for their device [or the most optimized], iOS 6.1.4 for iPhone 5, iOS 6.1.3 for iPhone 4s, etc
Force apple to re-sign at least the last update of the version [iOS 11.4.1, iOS 13.7, etc] and force android manufacturers to stop their downgrade lock... Samsung prevents downgrade once your device is on a certain build/security patch...
Allow users to downgrade to the version designed for their device [or the most optimized], iOS 6.1.4 for iPhone 5, iOS 6.1.3 for iPhone 4s, etc