I think that the people who want to use encryption should use their own software for encryption, which is separate from the cloud service. (This alone might not do, because you also need to implement other security, but it will be one thing to do.)
Or that everyone has to constantly manage a non-default set of tools, and deal with all the interoperability issues of all the mish-mashes of choices others make?
Or, ...?
Personally, I cannot see a safe online world that doesn't have hard privacy.
Why not give people easy ways to report "very bad behavior" online, to authorities that build up a reputation of responding responsibly. Including bounties for the most egregious stuff.
Then every recipient of anything rotten becomes a honeypot for the criminals.
Breaking everyone's privacy is going to attract every nefarious and security conscious actor in the world to the buffet. Every state actor, "good" or "bad" is going to want to have access to everything that can theoretically be accessed. Worst possible kind of honeypot.
At that point, I feel like we've opened pandora's box. If every single app had to be able to decrypt/encrypt with your personal key, we just know someone will roll their own and fuck it up for everyone else.
In NT you can have modules that sit between various operations on the file system. It’s how AV works without having to hook into every single application that reads and writes from storage.
There’s no technical reason why this kind of approach couldn’t be applied by Apple for encryption. But it would require relinquishing some control over their platform, so it would never happen.