That is very true
I went for the 70-300mm vr g-ed if as a telephoto to complement the 18-140mm
The 18-140mm is f3.5-5.6 same as the 18-55mm
the 18-55mm des give slightly sharper images than the 18-140mm
the 18-140mm does not have the focus motor on the lens as the 18-55mm
in my experience using the 18-140mm for events and people, it does a great job. sharpness can be adjusted during post processing when shooting in RAW
The 18-140 does in fact has a built in focus motor. I agree that the 18-55mm lens does give slightly sharper images, but over all I would take the 18-140 any day.
(I have both).