I presume you are an emergency contact for some people? Maybe a spouse, or a kid? Or even a friend? What's your contingency for when they are lying bleeding somewhere and someone can't reach you since they are not on your contact list?
I'm not a doctor, and even if I was, I'll never be able to help them purely over the phone if they are "lying bleeding somewhere" and I'm not around. If my house is burning down and I'm away, what am I going to do about it remotely that a phone call will solve? I'm not a firefighter and I can't splash water over RF. If something happens at my kid's school, I'm not there, and even if I was, I probably wouldn't be able to do anything about it.
That being said, if someone really, really thinks that I can somehow help them over the phone in an emergency, despite my number not being 9-1-1, certain family and friend's numbers I allow to punch through DND and reach me.
I might like to be informed of emergencies, but I'm not a first responder. If you are bleeding phone 911, not me.
To be fair, my mom sends my wife a message to tell me to "check my phone" if she needs me :)
Each person finds their own level of intrusion they want from their device. I've picked mine. You pick yours.
If I'm being frank, that extra minute for me to respond probably won't change their fate if they are indeed bleeding out somewhere.
i try to tell people about the "two calls in a minute lets it go thru" feature because as of yet the autodialers don't know about it or have it implemented.
I do the same as commenter up-thread, my voicemail inbox is empty. Sometimes I let a call ring out and then listen to the message immediately, I just don't want to have to deal with it synchronously. Then if it's 'I have a number of opportunities that seem like a great fit for you' I can just delete it and move on with my day, not have to try to say no-bye politely before hanging up, for example.
Someone with a full inbox is more likely someone who does the opposite - they'll never listen to their messages because they want to talk to someone, you'd have to call them back anyway so no harm it's full. (Or they'd call you from the missed call, not because they heard your message.)
people with professional and PhD with full mailboxes do this, with jitter of up to hours.
the last full voicemail i hit i was called back nearly immediately, and they said "what, i just delete all my voicemails, if i call it says no new no saved"
There's a reason i'm harping on specific elements so much, because i don't think voicemail is magic, i guess.
do these people have voicemail boxes like this (nsfw language, a bit. idk. it's art.): https://nextcloud.projectftm.com/index.php/s/NSFW_voicemail_...