What you say is true, but can you imagine trying to explain to the average user that the reason their phone is running slower than necessary is because they are

What you say is true, but can you imagine trying to explain to the average user that the reason their phone is running slower than necessary is because they are using applications which necessitate multiple libraries be loaded simultaneously? From Apples perspective, the App market is so saturated that any missing functionality will be quickly replaced. This way, everyone gets a performant system without needing to know what the difference between a 32bit app and 64bit app is.