Totally agree, and well-said, Caracas..
I think, in the hierarchy of Glee, the "NewKids1.0" (Ryder, Marley, Unique, etc.) get the shaft more than any of the other groups. I think their storylines were mostly recycled (except the catfishing storyline which A) was TERRIBLE, and B) Got no resolution), and the kids did their best, but the momentum was long gone by that point. (I confess to having a mad-crush on Blake Jenner. Because? SHoulders.)
The "NewKids2.0" did serve to revitalize the show a bit, but by now the fractured fandom (and craptastic writing/story arcs) was just too far gone. WOuld I have liked to see more Roderick, Jane and Co.? Absolutely, but not necessarily at the expense of the OG's. (If they dumped all the SUe crap from this season, maybe focused on a small handul of the alumi each epsidoe, and how THEIR sturggles related to the NewKids2.0 life, it might have been salvageable.
But, as with all things Glee? Too little, too late.