[acdha]

They control the entire system on a chip — remember how long it was before Android devices started to have the security features which Apple introduced in the iPhone 3GS? That took Google getting phone vendors to get the CPU vendors to all work together, whereas at Apple that's a couple of teams all working on the same product with the same incentives to make it succeed.

[lern_too_spel]

With Apple, it was security theater. With multiple vendors working together, it has to actually work to get everybody on board with putting in the resources.

https://www.wired.com/2009/07/iphone-encryption/