Same reason FileVault isn't on by default on macs.
Apple could do a lot to promote this feature to more advanced users, but they don’t. I don’t believe for a second this decision is unrelated to the government pressure they’ve been receiving from the UK.
The best analogy I can give is the way Apple gradually raised MFA from an optional feature with 1-2% adoption to a recommended feature that had majority adoption (even if it was not required.) They did this by heavily encouraging users to turn the feature on during setup, and then bugging them about it after setup. Apple is capable of encouraging and advertising security features it cares about, even when there’s risk.
1. Legacy devices are going away naturally. I doubt the number of Apple accounts with legacy (iOS/Mac) devices and routine iCloud usage is anywhere near a majority, and I assume the number drops every year. You can test for this condition whenever a user adds a new device, and encourage adoption for people who don't have this problem.
2. Apple already requires that you have backup phones and emails for MFA. They could easily enforce recovery contacts as a basic requirement for any new iOS device (even if ADP isn't turned on) and measure the stability of those relationships over time, until they're confident that these recovery relationships are viable. This would probably reduce their support costs as well.
3. Apple has a tool called "Safety Check" that's designed to help you secure your device. Last I checked, ADP isn't recommended or even mentioned by the tool as an option. This seems like an obvious place where Apple could boost understanding and knowledge about ADP, but they've chosen not to.
So yes, I do think there's quite a bit more that Apple could do. I think it's unfortunate that people believe that Apple is not currently downplaying this feature globally due to the UK mess, because that is certainly what they are doing.
Maybe people think that was all for show but I’m struggling to think of other examples of massive companies saying that so publicly/firmly. See also, all the times the police/FBI/etc have complained or even tried to force Apple to provide a backdoor.
All that said, I guess a, very legitimate, argument could be made that if Apple provided ways to swap out iCloud for whatever service you wanted then there might be an escape hatch of sorts even if iCloud was compromised/limited.
Would be a shame if they claimed they can’t decrypt but an old back up had the keys to the kingdom
I can't sign into Apple Music on Android because it doesn't support security keys – small price to pay.