All I have to add is that I am not a person into Skratch or sweat tests.........but I did experiment with adding some sodium to my Gatorade mix and it REALLY changed the game for longer rides.
I was shocked. I used to get home from 3 hour gravel rides and almost cry sitting on the floor of the shower it hurt so bad. Now.......I have to physically dig hard to make it hurt that bad instead of my hydration being a factor.
I feel it also aids in recovery to nail it down.