I agree many meetings should be emails. But when meetings happen, generally someone takes minutes and notes down actions so, that covers that base I suppose. Secondly, if I’m your employer, or your client, and I call you with a request, or a job, then it’s probably in your best interest to get it done. Sure, a follow up email is sometimes warranted, but not always. People who refuse to use the phone to communicate verbally are only disadvantaging themselves.