exchange PAIRS are literally order books with two assets.  Why would XMRBTC traders, for no reason, calculate the XMRUSD price, then calculate the BTCUSD price, then divide the two?  The order book has a bid/ask/LAST price right there!

Bisq is a p2p bitcoin exchange that uses atomic swaps between cryptocurrencies.  It doesn't just randomly inject USD bullshit into each trade!