I remember when snowboarding was brand new. People were falling , eating it, and boarding was not allowed at any ski resort in the US. Then with time, folks got better, way better, so did the equipment and it soon became mainstream and now is a huge, huge industry.
The goal of kayaking is to run lines right side up, but sometimes you go over and have to roll up. And some times you swim. We all have.
With stand up paddling it is the same goal. Try to stay on your board, you may fall down, but get back up, if you swim hop back on and keep paddling.
There are runs you can do all day with out fallilng, just like there are kayak runs you can do with out going upside down and having to roll.
It was super cool to watch stand up paddlers in Westwater make it through rapids successfully, meaning not falling. Every rapid was done clean by some, except Sock it to me. That one is tricky.
We all had fun, that is the key to a good day of paddling