initially just the observation that Bitcoin and Monero are more similar than they are different. to say nothing of LTC or ZEC. and although it's fun to debate the nuances of design, it's more important to emphasize what is similar. Bitcoin is described as chains of digital signatures in timestamped PoW blocks. everything after that is our own assumptions about what it *should be. It's not particularly relevant that Satoshi elected on a particular design, as long as the fundamentals remain the same the specifics could be almost anything. the only thing that makes "BTC" special is the huge hash rate and first mover advantage. therefore, #Bitcoin is a template and any sufficiently decentralized PoW chain should also be understood to be the same. They are different in security and features but are still Bitcoin.