As long as they work for you, there's no reason not to use them until they become burdensome. Just be aware of the danger of focusing on the lines rather than price. It is price after all that makes the lines possible. It is when traders forget that that they find support and resistance in such strange places.
Today´s premarket view: We are at Previous Day High, lets see if buyers can take on sellers and push the trend upwards.
I'm surprised no one noticed that all of yesterday was a hinge, with the midpoint ending up at that same premarket midpoint from yesterday: 65 (see yesterday morning's post). Naturally this all carries implications for what was the upcoming trading session.