Whenever I point out that Apple's "security by obscurity" strategy is a complete failure I get downvotes.

Person suspecting their iPhone has been hacked has no way to check it. Apple only offer cope mechanism in form of "lockdown mode", which likely can be bypassed just as well.

This situation shows that Apple devices are not secure and liability.

They'll likely protect your grandma from getting low effort malware, but if you are a CEO - buy something else.