To be honest, the chase itself has made the regular season useless. Unless you at least win a race, it matters little outside of the same tracks that are in it so the wavers in a way don't even make that massive of a difference, they are only serve to further highlight how useless the regular season is.
		
		
	 
As I said in the post you quoted, my problems aren't really with the Waiver, More the Chase in General.
Hypothetical situation:
Guy in 16th who has competed in every race is fighting to be top 16 to earn a Chase spot. Now all of a sudden he gets bumped by a guy who missed over a month has 1 win and is sitting in 29th in the points.
Does that seem fair ?
That's the biggest part the Waiver can really play in affecting the Championship and in 2015 something similar to that happened with Kyle Busch and he ended up winning the Championship because of it.
Going into Richmond (The final race before the Chase 2015)
Kyle Busch had 4 wins and was 27th in Points.
(I don't know where he would have been after Richmond points wise, But it certainly wouldn't have been top 16.)
So by being 20-something in points with a Waiver He bumped whoever was in the 16th Chase Spot who raced all year and deserved a shot at the Championship.
If it wasn't  for this Chase Format though, None of that would have mattered though. Kyle Busch never would have been close to the Championship on points alone, But the Waiver and the Chase system resetting points after Richmond allowed him to essentially restart his fight for the Championship. Plus by having 4 wins he became the 2nd seed going into the Chase. Earning bonus points for each regular season win.
He essentially went from 20's in points to 2nd seed in the Chase because a Waiver.
He's the 2015 Chase Champion, But only because of the Chase and the Waiver he was given.
If not for the Waiver at best he would have been 17th in points at the end of the Year.
The waiver is a problem, But the Chase as a whole is what allowed that nonsense to take place.
Behold, The great Wall of Text.