Most for consumer hardware and software eventually goes out of support. There’s a difference between going out of support and downgrading to an old out of date operating system.
As I said above it’s two different things between going out of support and downgrading to an out of support operating system.
Why is it different? The only way I can think of it being different is for users going way back, so Apple’s pathetic little yearly chart will get a little skewed towards older versions. Then again, I’d be interested in the actual numbers: how many of us would downgrade? I’d probably downgrade three devices:
-My 9.7-inch iPad Pro, which was forced from iOS 9 into iOS 12, back to iOS 10. My iPhone 6s would go through a similar process, but from iOS 13 instead.
-My iPhone 5c, forced into iOS 10 from iOS 9 thanks to a boot loop, back to iOS 9 (not iOS 7, as any version prior to iOS 9.3 does not have Apple Music, which I need).
The rest run the oldest versions they can. How many people like me are there? Not many, not even on enthusiast forums like this one. The numbers would be negligible. Forum members in general aren’t even representative of the real world. I’m not even representative of forum members. We aren’t enough for this to matter, so why not do it? Very quietly flip a switch. Only enthusiasts would notice. Of those enthusiasts, a minuscule portion would downgrade.
Why don’t developers support older iOS versions? Because nobody runs them. Therefore they don’t care. This will be the same scenario.
I’m guessing because after 7 years the hardware isn’t supported. The 1 gig ram just doesn’t support newer operating systems in a way apple would like. Hence the iPhone 6 is out of support.
It’s only my guess as to they don’t want to risk the reputational damage if apple allowed something that could be a problem for users.
But it’s insecure, so Apple shouldn’t want anything to run any version other than 16.4. It’s just not coherent.
As far as reputational damage goes, yes, it will obliterate the iPhone 6. Therefore it is okay for Apple not to support it. As far as downgrading goes, older devices already run older versions. Security updates aren’t guaranteed forever, and even though some versions get them, they don’t get all of them. Therefore, they’re insecure, therefore, those updates are irrelevant, therefore, they’re unsupported anyway. It just doesn’t add up.