You’re missing the point….I don’t care that these devices cannot get iOS 15.4.1….they work fine on iOS 12 or wherever they stopped. Your point is valid, they would run terribly on the latest firmware, BUT the device should still have access to apps to be useful.
This is NOT Apples problem. Blame the app developers. Period.
Your video apps require making connections to a service to retrieve video. The vendors presumably are constantly updating their apps and ensuring that the backend servers only talks to a range of apps on users devices. Once an app falls out of that range, it quite likely will no longer connect.
You have an issue with apps like Netflix, then take it up with them. NOT Apple.
And as for blaming Apple for trade-in values - utter nonsense. The market defines trade-in values and as a device gets older so does its value.
If you feel the trade in values are crap, then why on earth would you expect and old device - that you yourself have admitted hardly works, to be worth anything is beyond me. Why would ANYONE want to pay money for a device that is again, in your opinion, worthless?
Meanwhile, I’m finding quoted values for a base Air 2 from $16 up to $72. For a device released 8 years ago those are amazingly good prices.