It shows that only animals of the same genetic code can reproduce. Dogs cannot reproduce with cats, rabbits cannot reproduce with guinea pigs
the evidence is that "species are only related within these distinct kinds" as you said above.
I think you are using the phrase "the evidence" incorrectly. By "evidence" you seem to mean "that which would have been apparent to a simple farmer 3000 years ago".
Would you limit the microbiologist or the astronomer to the information they can gather with the naked eye? The chemist to grinding with a mortar and pestle? The engineer to measuring with a marked stick?
Then why limit biology to watching animals breed on the farm? Why exclude the record left in our genes? In the ground? In our anatomy?
This is the real "benefit", and the stated intent, of ID. Its purpose is to stop knowledge that undermines the religious views inherited from the past. It saves the Biblical literalist from having to imagine a complex God.
Capt.