Why is EVF a negative thing?

Serious photographers are a bit taken and shocked to see the OVF for the first time and declare they cant work with it.. it would be a risk to jump in and try doing pro shoots with it until they understand it, any major functional change with a camera takes some learning.

But if they see some of the advantages then they can be swayed, live view also means live-exposure, active preview in the viewer is really nice (no more chimping at the big screen) etc etc..