IDK, my iPhone will show me the live transcription of the callers message without me answering it. And then if I want to speak to them, I can answer the call in the middle of the message being left and talk to them.
Sounds cool, but this concept isn't at all new. Anyone who used answering machines did exactly this. You would listen to the message being left in real-time and pick up if you actually wanted to talk to them.
If people can't be bothered to leave a message, then that's their problem.