[ghaff]

If it’s important they’ll leave a voicemail that I’ll notice sooner or later—as I will that there was a missed call. If it’s a number I don’t recognize and there’s no voicemail I’ll assume it was junk.

I just have very few notifications turned on. For example none of my chat programs notify.

[illiac786]

It was never the statement the number is unknown though.

You’re talking about your case and you’re applying it to everyone. Some people want more notifications, need more, some don’t (you).

I perfectly understand that a missed call can be critical. Some callers are not very bright and don’t understand that if it’s critical they should leave a voicemail or send a message. I deal with such people a lot.

[ThisIsAWhatWhat]

Exactly, but even a voicemail isn't enough if the phone doesn't produce a repeating audible notification that you received one.

Sad that we have to explain this to people.

[ThisIsAWhatWhat]

Which proves that such a feature would be harmless at worst.