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It seems like an arbitrary sso to offer as the only option.

Got it. One of the differentiators of Memo is the deep Slack integration, for example with the recently launched Message Menus: https://blog.memo.ai/10x-your-slack-apps-ux-with-message-men...

We plan to offer G Suite and GitHub sign-in soon.

Slack accounts are separate for each team you join. A lot of people join a handful of public and private teams. This means we have to create an account each time?

For now, yes. We've noticed that quite a few Slack users have multiple teams, but most of them have just one team in which they spend 80% of their time (usually it's their work team).

We're also planning to add other team logins (G Suite & GitHub) and we also expect Slack to improve the experience for users with multiple teams.

Why not normal username+password authentication?

We're focusing the product on "teams" (technical teams more specifically), so signing in with your "team identity" (Slack, G Suite, GitHub, etc.) helps power all the collaborative features (@-mentioning, sharing, etc.)

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