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Email is still great for DMs if you only use it for talking to individuals, and not to sign up to things
(self.showerthoughts)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
Yeah, it's not without faults, so ProtonMail and similar may be a good compromise, or encrypting and sending longer documents. Ideally one day email will be rebuilt from the ground up with encryption.
Also to address your later comments, E2EE messengers are great, but short form writing is simply a different use case from long form.