I think it would be best to accept that different types of technical solutions work well for different people. I think it is great that we have so many different options available today. I would prefer even greater diversity if possible.
I appreciate the silent high frame rate solution offered by Sony in this camera but it is not cost effective for me and I would like an optical viewfinder nevertheless. I can see this would be very useful for some applications; not necessarily sports but e.g. weddings, funerals, and concerts, for those who can afford it.