OU fans who complain about not getting into the playoff because of their schedule are delusional. OU didn't deserve to sniff the playoffs. They beat (maybe) 2 good teams this year. I know I have a different underlying opinion on this than most: I think a playoff spot should be earned, but I think many see it a something that is lost. OU didn't miss out on a chance to get into the playoffs, they didn't win enough games to earn it.
I don't know if they're delusional or not. You can't win a NC without a ticket to the CFP -- so just getting there is the goal. A pillowy soft OOC schedule was good enough for Washington to get in. If UW had to play Ohio State and Houston in the OOC would they still be 11-1 and in the CFP? Maybe, but I wouldn't bet on it.
Not to mention, SOS-wise, going forward, a Big 12 playoff contender will (likely) have played one of the top two teams in the conference twice -- that's at least 10 P5 opponents on your conference schedule alone. Ohio State and Alabama, by comparison played 10 P5 teams total this season. Clemson and UW played 11. Clemson (South Carolina State), UW (Portland State) and Alabama (Chatanooga) all played FCS opponents this year too fwiw.
Anyhow, I think (and I imagine you'd agree) that there's a balance to be struck between OU's 2016 schedule and Washington's 2016 schedule. I think K-State's schedule next year strikes that balance well enough. I understand the aesthetics of the FCS game irks you, but to me, I view Central Arkansas as the practical equivalent of a San Jose, Idaho, or New Mexico State.