My view is that focus by wire will never be as good as mechanical focus, it lacks feedback that you get with the “old way”. Same for power zoom, both these technologies are flashbacks to the 90’s they’re here for video users, not stills photographers.
The photo industry does not always take the road that it should, we’ve seen this in the past.
Source Article from http://www.dpreview.com/news/2013/06/12/just-posted-our-canon-ef-40mm-f2-8-stm-lens-review
Started out doing photography at the age of 6 using an uncle's old 1940 kodak brownie box camera. At 15 years of age, I decided to buy my very own 1975 Praktica SLR camera. I now shoot with a Nikon D850. I do unpaid TFP and commercial paid work. 
