These coins have their use cases and they offer better performance compare to their king ( Bitcoin ) and their team are very active as well
I have done a well research and the bitcoin forks you listed are one of the worst performing and ones without any development. They are not anywhere comparable to popular bitcoin fork like bitcoincash let alone bitcoin. If you are going to diversify your investment away form bitcoin, do it on proper alts than a bitcoin wannabe. Go 75% on bitcoin and give 25% to coins that are not SHA256.