All that a soft touch does is present a larger and more confident "landing" area for the finger. There are so many about that it is quite a risk to take a stab in the dark with just any one when in fact they must be matched to the thrown of the shutter release and any nearby controls which could interfere with the release because of the size or design of the "soft touch". There is of course the physical perception of less shutter "whack" with these things, that are also perceived to reduce jerkiness, though in active practice I haven't found much of a difference. All my photography is done with a cable release (as bulb mode is very often used).