Most of my paddling is what can be called “flatwater” kayaking. I put my boat in the water someplace, paddle for a while, turn around, and then get off the water in the same place I launched. It’s not that the water doesn’t move, just that there’s no overwhelming, one-way current that prevents me from returning to where I started. Even when I get on the waves with my surf kayak, I can return to my parking spot. Where I put in is where I need to take out.
Whitewater boaters leave a vehicle where they plan to end up, then drive upriver to their launch point. Two vehicles and drivers opens all kinds of possibilities. My only experience with this was years ago when I brought my sit-on-top surf kayak on a Lake George vacation with me.