How much suffering? Some people seem to suffer a great deal more than others.
So this boils down to either most people having a lot of unnecessary suffering (if the bar for required suffering is very low), or “mysterious ways” (if the bar is different for different people because reasons).
I don’t see that this particularly helps though, given that the world is also very boring, frustrating etc. So it’s almost a problem a lesser evils. Whether it is possible to have a reality with zero boredom, it’s pretty clear we are very far from any optimum.