This is only a revelation for those who are new to watching football. Look at the great regular season offenses that got stifled in the playoffs in the history of this game.
Our 2001 Rams got punched in the mouth in the Super Bowl. The skill talent differential was profound but it didn't matter because of the trenches.
The old Jim Kelly loaded Bills offense got bullied by the Giants, that was such a mismatch outside of the trenches (in skill position players the Bills were insane) that it still took a Norwood missed field goal and they lost.
The 15-1 Vikings ran into a Falcons team that ball controlled them out of the playoffs, same deal where the differential in skill position was insane but didn't matter.
Or the undefeated Patriots team that was loaded and rolled everyone in the regular season being upset by the Giants thanks to a DL that set up shop in their offensive backfield.
If you run into an opponent who beats you well enough in the trenches you're gonna lose. Always has been that way and always will be.