I'm sorry but I still don't get it.
We won the Senate. Schumer is majority leader. Yet we still don't control the committees, and Repukes continue to set the committee agendas. It's especially galling that Merrick Garland's confirmation is deliberately being stalled. 
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Republicans and Democrats generally know how many seats they will receive in each committee before Congress convenes. Third party and independent legislators may be assigned to committees through either party. The parties select their desired committee appointments through a system which allows experienced legislators first choice of appointments by seniority. In most cases, legislators opt to stay on the committees they served in previous sessions of Congress. A drawing is held to determine the order in which new legislators may pick committee assignments. After all committee assignments are chosen within the parties, the parties' senators and representatives vote on whether to approve the slate of appointees. Once each party has approved its slate of appointees, they are presented to the full House or Senate for approval. Approval votes – both within the parties and before the legislative bodies – are usually approved without significant opposition.
Gov'ment is complicated. 
isn't a winner-take-all/everyone else is screwed system. It was designed to give bigger majorities chosen by the people more power than little ones, but most often some power to all by various mechanisms that force compromise and agreement.
But we don't have a bigger majority. We have just barely, barely enough to push the system our direction against those pushing the other way -- a lot of the time, and now and then someone will support the other side of an issue and power will shift.
What's gone wrong with congress isn't that everyone has some power or that we have to cooperate but that today's Republicans are misusing their power in ways and to a degree the framers didn't anticipate.
We are SO fortunate to have gotten our skin-of-our-teeth majority and can still accomplish a great deal. Perhaps just as important, given what they've become and have been doing, the Republicans canNOT.
