Actually, no coin or platform is perfect and has it own unique sets of problems, Steem exists because of some inefficiencies with Satoshi Nakamoto's bitcoin likewise if Nano exist there must be some other inefficiencies with current cryptocurrencies too. If one coin excels at something than maybe another coin excels at some other stuff but none is the holy grail of coins or platform rather they can coexist and complement each other in the whole decentralized ecosystem(just like we have different protocols forming the base of the internet), so we thought of just summarizing the concepts to the readers and we are glad that you liked the article.