The NBA playoffs are vastly different from the regular season for one reason. From November through mid-April, a team tries to build from day to day and game to game, and a player's statistics are built with that schedule. Wins matter, of course, but great personal stats can elevate a player's status even on a bad team, just as poor performances do the opposite even for a good team.
But now, all that matters is winning four games in seven tries. That's it. Cumulative stats are largely irrelevant. What a player does to earn those coveted wins carries far more weight than anything else, with the exception of the occasional but truly phenomenal performance that helps the losing team still believe in itself going forward.