It is relevant for a couple of reasons:
You can't discount the Cowboys' record the last 5 years, which was not 4 NFCCG's and a SB (which was 2 WC losses and 1 divisional loss) and just go back 7 years to the record with the Packers for convenience.
Then fact that no HC has won a SB with 2 different teams, is just that.
So, if the expectation is to flounder in the playoffs and don't win a SB, then fine.