Regular season defines the calibre of the team.
But playoffs determines the winner of the year round tournament, which is the dramatic part. Doesn't change who the best team is, or erase a lot of great memories.
Of course the playoffs matter, but at the same time, it comes down to who performs in a small sample. It's random. It's compltely crazy to try evaluate why anything happens at this point because there are so many random factors at play.