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I second that notion. It comes down to priorities and right now bots > security.

It's not that easy: How would you exchange the private keys when using multiple clients? This would require to user to transfer the private key files or to remember a secure password. Both options aren't possible for usability reasons if you want to beat WhatsApp.

This has been discussed a lot in the issue thread. Key exchange really isn't the issue.

Scanning a QR code or creating a secure connection between the clients to exchange the keys isn't that hard.

What when I want to login at a computer but don't have my phone with me?

Same as using 1Password — you don't.

You're trading convenience for increased security.

This is why it isn't 'by default'.

End-to-end encryption by default kills one of the advantages of Telegram - crossplatform history synchronisation.

this shouldn't be an issue when the clients share the private key.