FYI we floated our local “lux” creek last weekend and it’s fairly slow flow for the most part. We were in a flat bottom and my son was in a kayak. I got him to get right beside us and see how fast he could go compared to us. There was no comparison, he took off like a jet, then came back upstream with no effort.
That’s when I decide to get us a couple. If it came up a storm and you were in a hurry, it would matter, and you will not go upstream in a flat bottom without some form of motor.