What they are not telling you: non-bitcoin blockchains have more functionality than bitcoin's blockchain, but they are not indelible like bitcoin's. These otherblockchains will need to anchor to the bitcoin blockchain to make their blocks and the transactions that make up those blocks indelible. And bitcoiners are fine with that, because to anchor to bitcoin's blockchain with a hash, they need to buy and spend bitcoin transaction fees that go to the miners. They need bitcoin validation due to its unequaled mining power that drives its indelibility.