Fair enough... but nobody "found" the GnuTLS bug until the effects of it became apparent. Then the Open Source community started looking for it. That's what runs counter to the claim of "many eyes on the code makes security". Nobody was really looking and nobody noticed that some random cert could be reported as trusted for almost ten years. It's just a truth even I've advertised about Linux until I find the truth has been shattered.
Ignorance isn't blissful at all and this very thing is the weakness of closed code - not many eyes looking and things get fixed retroactively after the effects are revealed. However, Apple realizes the great majority of users don't know a thing about computers except they're appliances which need to work reliably. Apple knows they're not allowing the Dancing Pigs into the iOS spectrum and with that comes restrictions which will frustrate some people. They don't advertise anything different from that. So far, they've made 800 million iOS customers really happy at the expense of maybe 100,000 code monkeys.
My bigger problem with Android is who the mother ship is; Google, which has turned into a spy agency in their own right. They've brilliantly created a portable vehicle to map and catalog your every move and view. Their business model is to destroy your privacy and sell what they learn about you to marketers, the scum of the earth, without restraint or remorse. Apple, on the other hand, is well known to frustrate efforts by marketers to gain access to your private data. Frankly, I don't like computers or cars all that much and don't code or race anymore, but I have to use them. Since I have to use them, I'm going to use something I like a lot and not have to worry about too much.