People may argue that the Frye standard is out of date, but I like it. We should make absolutely certain that scientific evidence is widely considered valid before it is allowed into evidence.
Let's take a look at criminal law, for example. The polygraph test was ruled out because it was too uncertain. Justice is not done if a defendant is allowed to be prejudiced by science that may or may not be valid.
Does that mean some guilty people will go free? Maybe, but it is better for 10 guilty people to go free than for one innocent person to go to jail because of a flawed test.