Hey Luke, thanks for the question.

If you think about it, if markets behaved like that they would never move in any direction ie every time it got to 41K it would sell off, and every time it got to 30K it would rally.

This does happen semi-regularly, it's called ranging, but ranges eventually break one way or the other.

Trading/analysis is about assessing what potential outcome has the highest probability of occurring and, if that outcome also would yield an acceptable amount of profit vs the potential loss, acting on that assessment.