You actually can downgrade iOS but only if you are inside the "grace" period that is about 1 month from the first release. After that point you can't downgrade

You actually can downgrade iOS but only if you are inside the "grace" period that is about 1 month from the first release. After that point you can't downgrade anymore. In my case I always wait before updating because I have been burnt in the past, but this means that I'm outside the grace period. Even extending it to something like 6 months would be great.