Allow me to pause for a moment: first of all, what's bolded in the first quote box is precisely what has led me to stop watching. It has been obvious to me for years, it has been stated by teams and drivers for years to be true, and yet consistently I find myself in arguments about whether or not teams/drivers are putting in full effort year round at all 36 races or if the finale is in any way manipulated (as though the finishing results alone didn't tell you the answer). That is the legitimacy problem of NASCAR.
The second block is also part of that legitimacy problem and says a lot about NASCAR's leadership. NBC may very well want to have playoffs as a promotional tool for the portion of the schedule they control. This means that NASCAR has TV deals which fundamentally disincentivize drivers to compete with full gusto and which reduces the value of the rest of the schedule for NBC's benefit. Why do you think there is a midseason tournament now? It's the same reason you have stages and stage points. It is to provide some kind of correction to fix the problems created by the playoffs!
I understand some folks might like the playoffs and find the request to go back to an all season title hunt to be wrongheaded. I also understand that perspective would almost certainly lead to rejecting the relationship between it and the changes of stages and tournaments and so on, but then again, there also wouldn't be any need for those things to exist without the playoffs and thus there is no way for those people to explain why they even exist.