If a picnic were planned at the beach with friends, there'd be some assurance that shade umbrellas would be available to accommodate your abhorrence of direct sunbathing. If the picnic hampers featured grapes for dessert, there'd be some apples tossed in to accommodate your political boycott. In short, friends would adapt to your preferences and life would go on. But tell people that you prefer not to talk on the phone, and you are labeled an anomaly. There is no room for tolerance here, but instead outright discrimination asserts itself against anti-phone people.
Email is convenient.
Now let's look at email. Its biggest asset is that it is sent when convenient for the sender and received when convenient for the receiver. Contrast this with the telephone which serves as its master only the caller - the call is indeed a servant to the master's whims in terms of time of call, content of call, and most unhappily, duration of call. Simple etiquette says you can't be rude to your friend who has called to give you directions to his house where you are invited for dinner next week. How much simpler to have those rights and lefts put in email and arrive at your desk when the host wants to send it, and read by you when you choose to read it.