Yes, I think that the optimal intake of potassium is much higher than the recommendations and that those numbers are more of a minimum to prevent deficiency symptoms. You really don’t need to worry about consuming too much of any nutrient from fruit, unless you binge on high-fat fruits or fruits of questionable edibility. Potassium in a supplement may be dangerous, but the potassium in fruit is easily absorbed and utilised by the body, and any excess is easily dissolved and excreted. Potassium is an alkali element, and these are known for forming ionic compounds with very high solubility in water. Of course, pure elemental potassium will combust if it comes in contact with water, so you shouldn’t eat that, and as another commenter pointed out, a very small amount of the potassium in bananas tends to be radioactive, so you shouldn’t eat more than a few million bananas per day…