No it's not.

I'll do my best to make a long story short and explain it to the best of my ability, but YD is essentially one giant wallet. The tx's are processed in order that they are input. If "User A" would select a tx fee of 1sat/byte their transaction would take FOREVER to process. "User B" comes along and wants their btc off, they select of fee of 200 sat/byte but are second in queue. The transaction for "User B", while a higher fee, is stuck in line behind "User A" and their low fee. This would cause a clogging up of the transactions trying to process.

The way ethan has it set up is that it dynamically averages the costs of the most recent few blocks to ensure that the transactions will process in something like like the next 3 blocks (i don't know the algorithm he uses exactly). This significantly reduces the risk of causing a backlog of transaction trying to move off the wallet.