It’s kind of like string theory. It has a bunch of interesting conjectures but nobody can figure out a way to test any of it.
Take the “selfish gene” (the idea predates Dawkins). One of the theories states that it may be evolutionarily advantageous for an individual to sacrifice themselves for the group if they share enough DNA. They lose the DNA in their bodies but save the exact same DNA in the bodies of their extended family. That’s a nice idea and you can get the math to work out in game theory models but how do we test if that’s why ducks sometimes lag behind when a hunter tries to shoot them?
That’s not to say it can never be tested. There are other cases where we needed to wait for technological breakthroughs until theories could actually be tested.
That makes sense. Not everything needs to be testable. There are many interesting and important ideas outside of science.
The main problem would be if someone wanted to set policy based on it. That includes the implicit experiment of, “If we adopt policy A we can expect outcome B.” If we haven’t tested that before turning it into a policy, the policy itself becomes the experiment, and then we need to be very careful about the ethics surrounding such an experiment.