I think it is absolutely a justified feature. Just look at how long the Jailbreak Developers and community have managed to crack IOS, this actually means that despite the closed operating system there are flaws in it. In iOS 11 & 12 said by heart, it was even possible to simply jailbreak your phone from a browser.
Only on IOS 13 I put Mac OS on my Windows PC to use Checkra1n for my jailbreak (At least it wasn’t running on Windows, so dual boot Mac OS.)
I even know that there were ‘malicious’ advertisements, if you apparently clicked on these, these guys would get root access to your phone until it rebooted.
It was therefore simply possible to take over an iPhone via advertisements (if a user clicked on this), such as microphone, camera, files, etc. Full root access, such as with a Jailbreak. This security flaw is simply in the processor of the iPhones, I believe that under the iPhone XS this could not be patched with a software update. This security flaw in the A11 chip of my iPhone 8 Plus always stays in it …
Just switched to an S20 Ultra, satisfied again, after having had an iPhone 8 Plus for 2.5 years.