Given two scientific theories that both agree with experiment, it seems that unless the new one is much simpler, the older one is accepted. Why is this so?
- Special Relativity wasn't accepted until experiments contradicting Newtonian Mechanics where avaible, despite electromagnetism being more in support of special relativity.
- Likewise for general relativity, which would have been selected by occam's razor due to not having special reference frames.
- Our current theory is Standard Model+General Relativity. That "+" is really complicated, as it sort arbitrarily transitions from the Standard Model to General Relativity. On the other hand, string theories apply at both large and small scales. Of course there are many string theories, but one could be selected that is consistent with experiment.
One could say "if you don't make predictions, you aren't falsifiable", but the theories above due make predictions; that just so happen to coincide with the predictions of the older theory for the most part. So both the new theory and old theory are equally falsifiable.
Why are old theories given priority over new theories?