On the other hand, I (as a Gen Z person) have to actively persuade people to communicate with me through E-Mail. For example, if I am selling something online,

On the other hand, I (as a Gen Z person) have to actively persuade people to communicate with me through E-Mail. For example, if I am selling something online, say on eBay, people will hit me up with their phone numbers first. I don't see why they would want me to use something as personal as my phone number when we can much more easily communicate via E-Mail...