I wonder if, in the mid term future, you could see e2e encryption over slack and other offerings if you added slack as a team member—granted, they’d be storing the messages plain text on the slack side, but it’d ease and encourage transition onto keybase teams rather than eg SAML.
Sometimes, when Slack e-mails me that someone has mentioned me in a channel, and in the e-mail there is content of the message, I have a brief thought of "how do they know-... oh". I'm slowly getting used to e2e provided by various IMs, as well as encrypted at rest e-mail providers (personally I user Protonmail) - it's not something extraordinary anymore.
