Ultimately, if you trust the server then end-to-end encryption doesn’t add any extra security (as emails are already encrypted at rest and in transit). If you don’t trust the server, you can’t trust it to load uncompromised code, so you should be using a third party app to do end-to-end encryption, which we fully support. And if you really need end-to-end encryption, we highly recommend you don’t use email at all and use Signal, which was designed for this kind of use case.