Tired Light, Variable Speed of Light, and Steady State are all theories that I personally believe got thrown out too quickly. Some because YEC hijacked them to try to justify a 6 thousand year old Earth, making it career suicide to investigate as a serious researcher.

James Webb is hopefully going to make big changes. I find it notable that very few of its observations are being published soon after they are made. They are finding fully formed galaxies way too early, and having a hard time explaining it (dark matter is always there to rescue the BBT though).