I don't think they argue against all encryption (Do they?). Basically everything would become an encrypted group chat (Double Ratchet etc) where the 3rd party

I don't think they argue against all encryption (Do they?). Basically everything would become an encrypted group chat (Double Ratchet etc) where the 3rd party is the provider which can optionally encrypt/secure access. That would ensure the provider is the only one with a backdoor for some time until access to previous messages are lost. Similar to loosing decryption keys for GDPR compliance. Access to the keys would require a court order. Nonetheless authoritarian governments could and would misuse this. It should at least be required to have an international court order. Still very difficult.