I’ve played 52*/56*/60* for as long as I can remember. I just had an iron fitting and realized that my wedge gaps may be a problem. 
As my Titleist fitter pointed out, the wear on the 56* is heaviest, and it is my go to club around greens and certainly green side bunkers.  The 60* is used for those delicate, short side shots that need to stop fast. 
Since the 60* is more a specialty club. I’m curious if a 54* or the 58* would play more like the 56*. 
FWIW, the fitting pointed me to the T100S.  Given the lofts, my choices are 48*/52*/56* or 50*/54*/58*.  I wonder if I’d really miss that 60*
Would love to hear some others experiences.  Thanks!