But that doesn't mean it's "extra".
2014 Ranger's Natural Explorer and Favored Enemy were amazing and quite powerful.... for a character that would be involved in a campaign where wilderness recovery was difficult, and actual resource attrition once you leave town had real teeth. But D&D hasn't been that game since the 90s. In 5e D&D, the only RAW attrition you actually need to care about is ammunition. That's why people tend to ignore it.
So the 2014 Ranger didn't have free mechanics that did nothing. It had real mechanics that the design bought and paid for that don't interact with the rest of the game. That doesn't mean that literally anything that changes that and actually does interact with the rest of the game is "extra." It means it was fundamentally misconfigured before, and now it isn't.
Similarly, Sear Undead existing doesn't mean that Destroy Undead didn't exist or didn't have a design cost or that Sear is "extra."
Like I kind of see what you're driving at, but it's really weird to describe it the way you have. Better than bad isn't necessarily good. The logic just doesn't follow.