I don't think that pplication security/encryption is the issue. Rather the phone is comprimised by design (Google, Apple specific hardware and software) that allows for reading data before app encryption and decryption.

Once these "backdoors" exists, it is just a matter of time until government agencies gain access to it in some fashion.

Hence, US (home to Google and Apple and other systemic IT companies for that matter) does not seem too worried by end-to-end encryption, but other goverment are.