Do not conflate utility token with global money.

Steem has little to zero privacy features so it's tokens are hardly fungible.

Unit of account : Steem has a BTC, KRW and an unused ETH pair, how many pair does Bitcoin have?

Immutability / Censorship resistance : How much harder do you think it is to convince 20 people on Steem to change the ledger vs Bitcoin?

How easy do you think it is to deposit USD directly on Huobi? Binance? Bittrex? Bithumb? Blocktrades?

Hint, it's impossible, If anything they are trading for USDT

How easy do you think it is to turn your USD cash into USDT?

Only Kraken allows it (0.01% of the USDT market)