4 rotation players, 2-3 blocked shots per game each -- this is 10 potential misses per game. I don't find that pointless.
Second that. I find one of my player doing more and more often 2-3 blocks per game and yes, sometimes games are decided by few points. It is definetely very nice to have and the aspects mentionned about balanced training are precise, as well.
I wouldn't exactly train SB too intensively but I would want it to be at least present in the skill mix of my trainees.