The average American eats enough salt and potassium in their diet that they don't need to "manage electrolytes" unless they are going well beyond 30 mins of intense cardio...
As far as I can tell, this is mainly a problem due to modern farming practices resulting in less nutritious produce; there have been studies done on the vitamin mineral content of food over the last century, and there has been a steady decline in a number of different nutrients, including potassium.
The trouble is, it's also hard to supplement. To avoid stomach issues, over the counter potassium supplements are limited to 99mg in the US, which is only a few percent of the recommended daily intake. If anyone has any good suggestions on how to regularly get enough potassium, I would love to hear them.