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Now you missed the reminder from your dentist, a call from that relative whose new number you forgot to save

These are the types of people who leave voicemails. Robocallers are not...

In my experience, the robocallers are more likely to leave voicemail. You just get the first 10 seconds of their recording chopped off and the rest in your mailbox. So now you've just moved your issue from live calls to having to check your mailbox periodically to see if there's anything important mixed with the spam. Plus the added possibility that a legit caller doesn't leave a message, and something important gets delayed due to an inability to contact you.

… and? The point is that trying to maintain a 100% accurate list of numbers from which you want to receive calls from is a non-trivial amount of work AND it's useless as long as the spammer can just forge the number of someone legitimate.

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