IIRC the reason they don’t do e2e encryption is because you can access the information from the desktop without having access to the phone, you cannot do that with whatsapp, every desktop connection must pass through the phone, and that’s mighty annoying.
Yeah, you need to trust them that they will save the data in their servers in a secure way, but they have not betrayed the users’ trust since they are running, and several people trust them.