[mytailorisrich]

The main purpose of not to put things in writing and instead to discuss face to face has always been not to create incriminating evidence rather than avoiding and "unsecured channel".

When you're using Signal or WhatsApp or whatever you're still putting things in writing to someone else and the risk, as we see again and again, is that this is leaked by the receipient(s). Plus ça change...

This is almost the raison-d'être of posh private members clubs.