Earlier quoted context omitted.
Well, half of the point is that you don't want voice in the first place...
Voice is by far the least of the problems with voicemail. - If someone leaves you voicemail, you don't necessarily know that that happened. - Checking your voicemail is effortful. - Any random idiot can dial your phone number and leave you voicemail. - Voice is harder to process than text. Leaving someone a voice message doesn't help with #4, but that's a very minor issue. It solves all of the first three.
You can't check voice messages in many situations where you can read and possibly respond to a text. Also, if you listen to music/podcasts/whatever there will be an annoying interrupt.