> You can choose between secret chats (e2e encrypted) and normal which are just user-server storage-user encrypted.

I am aware of that, though I think in the second case it's better to pretend messages are not encrypted at all on the server side since mere storage encryption can be circumvented all too easily.

Anyway, having the choice between encryption and no encryption is exactly the problem. How many Telegram users choose e2e-encrypted chats? AFAIK you have to enable this for every conversation separately, right?