The idea that a team can build for the postseason or is built for the postseason is horse shit. It's something that the talking heads say and everyone nods their head, thinking "yeah, that makes sense."
But no one ever presents examples for this idea, nor noting teams that aren't built for the postseason and lose in an upset.
They want to sweep the fact that the postseason is very nearly random under the rug. I don't know why, but that's what they're trying to do.