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 mail

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.