None of this is false, but rankings shape the conversations and to dismiss them as "stupid" or meaningless misses the big picture. Rankings affect TV ratings. They affect reputation. They affect how much attention your program is getting on all the TV shows and websites covering college football. They affect ticket sales and attendance, which has an effect on revenue. They eventually trickle into the early CFP rankings because those voters take who you beat/lost to and how they are ranked into consideration, even if they tell you they don't.
So while we can all agree that they are highly inaccurate at this point in the season, it's not a good idea to just dismiss their meaning and relevance.