Use of meta data rich protocols like standard email, instead of, e.g., the signal protocol

Brother...its an email product though...if you can use Signal, use Signal. But it's a different product entirely.

When my bank sends me verification info and banking statements over Signal I'll be elated. Until then, we unfortunately have to continue dealing with email.

As is choosing operate from a jurisdiction that can comple them to collect IP addresses.

There is no such requirement. They collect them necessarily in order to function.

They are a Mail provider. You can't blame a mail provider for providing a mail service.

You are basically asking for them to make it seem like you send mail, but in reality you send the message via some other protocol when it's send to Proton users. At that point you might as well not send mail at all.

As for their jurisdiction: The data protection laws changed after they were founded. They are also lobbying against them and have in fact threatened to stop investing in or even leave Switzerland.

Which jurisdictions can't compel an email provider to log IP addresses? I've never heard of this

The annoying part is them marketing themselves as like operating from Swiss “privacy haven” when swiss privacy laws aren’t that good and the parliament is actively destroying them as we speak.