To expand on your first sentence: some past jailbreaks allowed booting different versions of iOS than the one with the bug, because they were lower-level (bootl

To expand on your first sentence: some past jailbreaks allowed booting different versions of iOS than the one with the bug, because they were lower-level (bootloader based). So you could upgrade for security fixes, upgrade for the latest features, or restore to fix a hosed system, all without losing your jailbreak. For a long time I wanted to implement that for userland jailbreaks, but I never did, and now it’s not really possible anymore. But that would have solved the “jailbreaks are inherently insecure” problem. But yeah, much better if the cat and mouse game weren’t necessary to start with.