The three-point shot is usually discussed as a change in shot selection. Its larger effect was geometric, because it changed where ten players stand and therefore where space exists.
The arithmetic came first
A shot beyond the arc is worth half again as much as one inside it. A player converting such shots at a moderate rate produces more points than a considerably more accurate two-point shooter.
Once that comparison was measured systematically, the incentive became difficult to ignore. Teams reallocated attempts towards the more valuable shot.
The mid-range shot was the casualty, since it carries similar difficulty to a three without the additional reward. Its share of attempts fell sharply.
Defences had to extend outward
Leaving a capable shooter unguarded beyond the arc concedes an efficient shot, so defenders must follow them out. That obligation stretches the defence away from the basket.
Each defender pulled outward increases the distance between defenders. The gaps that open are what a driving player attacks.
Spacing therefore became a coaching concern in its own right, with offences designed around where shooters stand rather than around the ball. Standing still in the right place became a contribution.
Positions were redefined by shooting range
Tall players who could not shoot from distance became liabilities, because their defender could ignore them and clog the middle. Range became a requirement rather than a bonus.
Interior players consequently developed perimeter shooting, and recruitment shifted towards those who already had it. Traditional position labels lost much of their descriptive value.
Defensively, the same players must now cover ground on the perimeter. The physical profile required changed alongside the offensive one.
The counter-adjustments
Defences responded by switching assignments rather than fighting through screens, which requires players capable of guarding several positions. Versatility became the defensive priority.
Some teams pressure shooters higher up the floor, accepting more driving lanes to deny the more valuable shot. The choice is which risk to concede rather than whether to concede one.
Others pack the middle and allow contested outside attempts, betting on low conversion. Both approaches persist because neither dominates across all opponents.
Where the trend meets its limits
Efficiency arguments favour more attempts, but variance rises with them. A team relying heavily on outside shooting has wider swings in results between games.
Playoff defences also contest perimeter shots more intensely, which lowers conversion relative to the regular season. Teams need interior scoring as an alternative when shots stop falling.
The balance now discussed is between efficiency and reliability rather than between shot types. The geometric change is settled, and the argument concerns how to manage its consequences.
