If you’re not running PGP commands yourself to encrypt and read your messages, it’s not secure.

Also no OS integrated system that does this for you automatically / conveniently has ever existed that was widely adopted because that application would have the ability to read all of your private communication, and impossible to install on an uncracked phone.

Still it would take literally minutes to vibe code an app that sits in front of a WhatsApp client and automatically handles these things. Maybe the future is just to write it yourself (not the security) so you can trust it and it’s convenient.