You would be better off comparing the non-divisional games of that year to get an accurate reading of the respective strengths if Seattle & New Orleans.
From memory, Atlanta won in NO in overtime, Saints beat them in Atlanta in the back end. Can't remember the final standings but Saints may have dropped one divisional game early in the season when they dropped a few.
Over the full season, any suggestion that Seattle outperformed NO & deserved home field advantage is ridiculous. Yes it's their system, and fair enough. But let's ensure that situation never arises in Australia. .
you're still not getting it.
as all teams dont play each other, being the best performing team against those who have the same schedule is what matters in the NFL. as such, outperforming New Orleans over the season wasnt the focus of Seattle. Their concern was about outperforming the other teams in their division that had a near-same schedule as them, i.e., Arizona, San Francisco and St Louis which they finally did.
New Orleans' focus were the teams they shared the near-same schedule with. these were Atlanta, Tampa Bay & Carolina. They were 2nd best amongst that lot and so had to earn a post season berth via wildcard.
seattle got the home playoff because they won their competition. New Orleans didnt. comparing overall W-L records in this case doesnt paint an accurate picture because they had different schedules. the fundamental basis is to win the division. the prestige is in the winning the division, not clinching the wildcard.
transferring the format directly into the NRL without modifications wouldnt work. for a start, all teams will still play each other at least once so the unique schedule isnt a factor. furthermore, the most realistic groupings would be 2 groups of 8, rather than 4 of 4 as the former provides more group games and hence more season games. there would only be 2 group winners and probably 4 to 6 wildcards. i would doubt that there would be 2 separate group playoffs in the post season too. so fears that the NFL system would deliver the similar results are clearly unfounded.