Who said it was?
So you're right, no one has a gun to your head but there is no "never" option and you're constantly nagged. Not to mention you're left out of the modern app ecosystem, which these devices are heavily dependent on for their function.
Oh, you can keep using your old device, you just can't have the latest version of iOS.
Oh, you want apps on your old device? Just install the "___" version of iOS!
Thanks for nothing!
Who said it was?