I really don’t get the logic of this play in format. Penalizes the 7th and 8th seeds. I mean all NBA teams played under the same circumstances, why not jus stick to the top 8 format?
2 main reasons:
1) Before the season began, and at the beginning of the season, it wasn’t clear if teams would play all the games. It was very easy to imagine where a team gets shut down for a month and plays 10-15 fewer games than another team. The play-in format was one way to deal with a potential uneven schedule allowing teams to decide it in the court against each other.
2) Having lost 10 games to the season, and a lot of revenue due to reduced/eliminated fans, the NBA needed revenue of some sort, so getting a couple of extra games in provides money and satisfies media partners who also lost a bunch of games last year. Especially if fans can be at the play-in games, it can be a revenue boon to the 7th seed.
I think that Reason 1 made them look for a solution, and Reason 2 made it happen.