Adding a short knockout stage before the playoffs looks like a small structural tweak. Its real effect is on the weeks before it, because it changes what a middling team is playing for in March.
The old cut-off created a dead zone
Under a fixed qualification line, teams a few places below it faced a season with nothing to gain from winning and something to gain from losing.
Better lottery odds were the only remaining prize, so the rational move was to rest players and give minutes to prospects.
That produced a stretch of fixtures with reduced competitive intent, which the league was still selling to broadcasters and ticket holders at full price. The product was being weakened by the incentives written into the structure.
Extra places move the boundary
The play-in puts the final playoff berths into short elimination matches contested by teams that finish just outside automatic qualification.
A team several places below the old line now has a live target, and reaching it is worth real money and exposure.
The dead zone does not disappear, but it moves further down the table and covers fewer teams than before. Several more teams end the season with something genuinely at stake.
Seeding pressure works from above too
Teams that would previously have coasted into a comfortable seed now have a reason to avoid finishing low enough to face a play-in match.
Because a poor final month can drop a team into an elimination game, the incentive to rest players late in the season weakens.
The structure therefore tightens competition on both sides of the qualification line rather than only below it. Teams above the line and below it now share the same anxiety.
The format is deliberately unforgiving
Higher-placed teams in the play-in receive a second chance if they lose their first match, while lower-placed teams are eliminated immediately.
That asymmetry preserves some reward for the regular season, since finishing higher buys insurance rather than qualification.
It also produces short, high-pressure matches that are easy to schedule and attract large audiences. A single-elimination match carries an intensity the regular season rarely reaches.
The objections are competitive rather than commercial
Critics argue that a long regular season should not be compressed into a single elimination match for teams that finished well clear of their rivals.
Supporters respond that the teams involved failed to qualify automatically and that a play-in is a chance rather than a punishment.
Both positions accept the underlying point, which is that the structure exists to make the final month of the season matter. Everything else about it is a matter of taste.

