Why is this still a 'thing' capable of causing contradictory advice? Over the past three decades most Western armies have developed water-replenishment rates b

Why is this still a 'thing' capable of causing contradictory advice? Over the past three decades most Western armies have developed water-replenishment rates based on environmental conditions and activity. They based these on actual empirical studies of performance and illness ( and fatality ) rates. Not dietary fads. Here's the US Army tables. The British Army ones are similar and are even more stringently applied, due to several incidents of soldiers dying because they tried to preserve their water. The squad now stops and drinks its water en masse. http://www.evans.amedd.army.mil/PM/WorkRestTable.pdf http://www.evans.amedd.army.mil/PM/WorkRestTable.pdf I only wore blue but even then if I showed-up on exercise with the wrong quantity of water loaded for the conditions it was a charge.