Some major differences between shifts in baseball then in fastpitch. First pitch type and location, although important in both sports, fastpitch has more upwards moving pitches where baseball has very limited, if at all, even with a sidearm pitcher. Second the reaction time is less, as the mound is much closer, therefore spray patterns become less important. Third the the double plane movement pitches. Not saying it can't be done but at 43ft its like a cartoon and MOST batters have to "go with the pitch " just to make solid contact. Shifts move both horizontal (side to side) and vertical (back and forth). The horizontal shift is very effective in both the outfield and infield, but is a move of sheer genius, when it works. Watching DD play against the D3 semi finalist, in the regular season. Pitcher was one of the best in Ohio. The opposing team puts a shift on in the outfield. Everyone to left field. Played 7 innings. Not one ball was hit to right field. Outstanding coaching strategy. No spray pattern needed. The coach knew his pitcher and how to keep batters out of right field. The point is Softball shifts are about knowing what type of pitch is being thrown and where, batters hand path, and some luck to get everything to line up. You see this more and more with SS or 2nd looking at the signs each pitch.
Already been said. More about shading in the infield. 60ft bases no where to really go...