Is Apple mad about this?
> The vulnerabilities presented in this research are present in iOS up to (and including) version 10.3.3 (apart from #1, which was fixed in 10.3.3).
This seems like it's old enough that Apple probably doesn't mind anymore.
It’s not like there is no fix for it.
A properly vetted update requires both compatibility testing and security testing. It would be irresponsible to push an OS update without verifying that it will not damage productivity or bring down defenses.