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.
I believe dynamic system for fee's are always better because there are tons of places that charges a ton of money no matter what and they are basically screwing everyone over because they calculate from the biggest prices in order to never lose money and that is why I believe there is this weird thing about making profit off withdrawals for a casino is somehow "fine" but when they lose money it is a "big deal" suddenly. That is why what Ethan is doing is fine, he is at least making sure that he doesn't lose money but we do not lose money neither, that way everyone is fine.
Yet there is still a bit more wiggle room, people may want to pay more so they can get it on the next block if it is possible or they might be fine to wait 10 hours for it, giving them that option would be cool as well.