[fieryscribe]

I don't find this so convincing.

Most normal usera may not be able to secure things effectively and they can still use the existing iCloud / Google Play infrastructure. That doesn't mean that other users, who want to manage their own data for one reason or another, shouldn't get the opportunity.

It's far more likely that building and maintaining this feature is not worth the development time for Apple and Google product teams at this point, since the possible market is small

[shmoe]

Exactly why it won't happen anytime soon, unfortunately.