[unhammer]

So,

The problem with key notifications being off is for those users who really want to be secure, and downloaded Whatsapp because they wanted E2E, but didn't know they had to go into settings and turn it on.

The problem with key notifications on-by-default is that regular users see warnings they don't understand and get warning-fatigue.

So how about making a default-on notification that is understandable for all users? Like:

::: It seems like Alice switched to a new phone (i)

where Bob can click the (i) for more info, or just ignore the notification. If Bob was security-conscious, he'd perk up at that message, while the majority would just go "meh" or congratulate them on their new phone.

[y4mi]

they'd get that message every few weeks to month from me, as i flash a new ROM....

[vorticalbox]

Which is ok asthe people you know would understand that you are that type of person.

I would also pop up when someone reinstalled the app.

Would be rather annoying but it should be on as default and the first time it pop up give clear information.

Whatsapp is set to notify you when a key changes, this could be due to a change of phone or reinstalling the app. If you do not wish to receive these notifications click here.

Which would allow users who want it to keep and those that don't to turn it off after the first change.