Exactly. Some kind of proven cryptosystem implemented with great UI on untrusted, online storage. Options to do it over various transports with HTTPS a default

Exactly. Some kind of proven cryptosystem implemented with great UI on untrusted, online storage. Options to do it over various transports with HTTPS a default that most users can tolerate. This one does all this fancy stuff which has so much complexity in its trusted computing base (TCB) that it's likely to get smashed somehow. That's assuming the protocols and interfaces are correct which is often not true. Plus, the "world's most secure" would probably use HSM's at some point with real ones at server and smartcards w/ open standards at user side. I know a guy working to commercialize stuff like that. Stuff running on a vanilla stack w/ unvetted code and non-tamper-resistant hardware isn't most secure anything.