In my opinion shootouts are justified only to spare players
unreasonable duress, e. g. student athletes with a class at 8:00am
the next morning should not be expected to play indefinitely.
It seems to me that the present system works fine and I hope we
NEVER see shootouts in college hockey.  Maybe some consideration
should be given to three points for a win, but that's it.
        That said, there are some important distinctions to be
made between these two sports:
1.  In hockey, at least, the penalty shot situation occurs
fairly often in "normal" play, i.e., breakaways that put a goalie
one on one with a shooter.  Breakaways of that sort are almost
unknown in soccer.  The soccer situation is far more objectionable
because it is so clearly "a different game" than the one soccer
fans love.
2.  The odds favor the shooter much more heavily in soccer.  The hockey
goalie can be "pro-active"; he or she can attempt to preempt some of
the shooter's options, to fake out the shooter, etc.  In soccer, the goalie
cannot move until the ball is struck.  It is pathetic to watch a world
class goalie flopping to the right or left, desperately using his
only chance to make a save.