Good analysis, but your use of the term "riskier" is misplaced. Does depending on Steemit (and its sister sites) make Steem risky when hundreds of thousands of people are using the sites? To the contrary, that provides a robust use case that the other cryptocurrencies you've mentioned are lacking. It's something that the Dashes and Litecoins do not have. Not saying they're not useful in their own ways, but having hundreds of thousands of people using your currency on a community site like this (and now processing nearly half of all transactions in the cryptocurrency world) adds not an element of risk, but resilience with one of crypto's strongest use cases to date.