Creator of crypt.fyi here! Thank you for pointing out the lack of clarity in the ‘why’ statement. It really should state that sensitive data is shared through insecure channels in plain text. The in plain text part is key, as it leaves the contents indefinitely vulnerable.

Is it too hard to ask normal people to use asymmetric cryptography?

Peoples eyes have glazed over at the mere sound of the words ‘asymmetric encryption’. It’s a bit out of touch of a statement to make haha. I believe these individuals still deserve more accessible tools that make them incrementally more secure and maybe it can be a gateway to even more secure/private solutions.

This detracts a bit from the convenience factor in that it requires both sender and receiver to download an app as opposed to having access to a browser. It is however much safer as the client is static and versioned so the privacy guarantees are better.