I think yes . Using dollat while exchange altcions are better alternative. Because at the end of that trade i am looking my profits in usd value. But while doing trade with a altcoin and if we are selling that for eth or btc that can be painful during dumps. Because we are losing some money twice . Eth dollar value decreasing and altcoins eth value decreasing so we are losing more money. So i think exchange altcoins with dollar is better than btc or ethereum.