You can supplement this with the OS share stats of android phone and combine it with the safe assumption that the majority of android phones are lucky to see one OS update. Consumentenbond in the netherlands estimated an average life of around 2.5 years. This is their source Android: beperkt houdbaar. Digitaal Gids
Add to this the resale value number.
I think you're making this more complicated that it needs to be. Android phones don't retain value as well because support is poor. There are few Samsung shops you can walk into to get OEM support and samsung is king of the android hill. Same with google and their name is behind the OS. Apple meanwhile, support six year old phones with software updates and even replace batteries inexpensively.
The point i was aiming for was that android phones aren't any less durable than apple's phones. They aren't used as long and this establishes a feedback loop where android OEMs must cut corners to maintain margins on devices simply because there isn't a revenue stream once sold.
End of the day, your old android phone working well is the exception. Apple know that what sells is the appearance of speed. That is a major reason why their phones sell, not because of GHz or GB or Megapixels.
