On: Apple can delete purchased movies from your librar...

[crispyporkbites]

Hmm, shouldn't it more be:

There's no sense upgrading an OS without maintaining backwards compatibility?

iOS is only 10 years old...

[wheelie_boy → crispyporkbites]

Backwards compatibility isn't free.

In this case, the root cause is probably the CPUs changing from 32-bit to 64-bit. There are costs of having 2 versions of all of the system libraries - maintenance dev time, RAM usage, battery life, etc.