At the end of the day, will NASCAR fans accept Ryan Blaney as champion? My guess is "yes" in no small part that a "post-season" has existed in NASCAR for nearly 20 years. Pretty much any fan under 30 predominantly knows and probably accepts if not prefers this format.
Like with Hudson O'Neal winning the Lucas Oil Late Model title, I'm not enamored with the system that produced it but also recognize that both NASCAR and dirt late models are not my primary focus as a racing fan. I can watch plenty of other things that I find more pleasing to what I want to get from racing.
As someone who honestly doesn't follow much week to week, my major takeaway from looking at the stats and the kinda lousy way in which the playoffs are structured and shown to fans is that Blaney could be stated as having essentially "won his way out" to get the title. I'd love to see it be explained otherwise to me what role the stage points may have played in him making the final 12 given that he won races in the next two stages to put him in the finale, and was in the playoffs largely because he won a single "regular season" race. The entire purpose of the stages as they are constructed from a competition standpoint (I understand the real reason for them is to have extended commercial breaks) is that they provide points which have relevance to the title picture. I'm not sure that there is actually evidence for this. It actually seems more or less like winning a race in the regular season to guarantee playoff berth followed by "in season testing" during races would have more value. Blaney won the 14th points race of the season out of 26: in the 13 preceding the Coke 600, he has an average finished of 12.5. In the 12 following the Coke 600, his average finish slips to 20.7. Starting position drops two spots from 11.8 to 13.8. Lots of context I'm probably missing though.