No system is perfectly meritorious. Even a 12 win team might have played 90% of the cellar dwellers while a 10 win team had a meat grinder schedule. Why not have each win not simply be a win? How about a win is a percentage of quality of opponent, HFA level, injury factor? Write up a Pythagoream theorum type calculation so everything is 100% meritorious.
Here's a plan: how about we break each PO race into a divisional one where each member of a division plays nearly the same schedule. The winner of that nearly same schedule earns a division PO spot. As well then allow two teams that achieved a good record but did not win the division race to be in the POs too?
Again yes there will be instances where a better team is further down in seeding or even not in the POs. But there will never be a perfect system, never. But this system now is a good one. And this system frequently provides one or two mediocre teams a chance for long shot-unrealistic glory. Expending it will see new depths plumbed for bad football in the playoffs. What's the point of "playoff" football if it has numerous teams that over the span of 16 games showed they are not the top tier quality?