Jackson's goal versus Everton would be an example of that. Similar to Darwin he spins and hits the shot in one. Doesn't make a clean contact though and he scuffs it into the ground. Or De Bruyne last night just puts his foot through it and beats the keeper for pace.
Nunez when he hits it clean tends to hit the keeper or the woodwork.
There's been a couple of those this season, Palace being the most recent. Where he's caught a shot too perfect when a scuffed shot would have left the keeper with no chance. See Gakpo's goal when it hits his trailing leg and trickles over the line (can't remember who against), sometimes you need luck in those situations
Again, placement isn't "luck". Nunez deliberately opts for power over placement almost every time he shoots at goal. When you prioritise power, you are more likely to hit the middle of the goal, making it more likely the goalkeeper saves it. Think how many times we have seen him blast the ball down the goalkeeper's throat this season when in a decent position. Too often.
His finish against Norwich in the FA Cup is something we need to see much more often from him. Placement, composure, and using a different part of his foot rather than lacing it every time.