Not to pile on the Committees, but
I took a moment to look at the BBWAA HoF ballot for this year for the first time. As it happens, there were five starting pitchers who fell off the ballot this year (with a total of three votes). In no particular order, they were Weaver, Dickey, Cain, Arroyo, and Lackey. For fun, I compared them to the most recent starting pitcher elected by the Committees, Kaat.
So, first, are these guys clearly better than Kaat? I would say that Dickey and Arroyo clearly weren't. Cain maybe. And Lackey and Weaver no doubt about it. Looking at this group, no one would pick Kaat as a clearly superior pitcher, and would think that if you did a "he's in the group", you'd be fairly generous to him.
Again, I'm by no means suggesting that even Weaver should be in the Hall, just again pointing out that the BBWAA does a pretty good job choosing players and the Committees continue to select players far worse than those rejected by the BBWAA, and really always have.