Part of this comes down to choices and (supposedly) our being better informed.
Now the water vs soda thing is, as described, a LOT bigger and far more common of an issue than any presumed level you and I could come up with for sarms/ped/roid use.
Take where I live (Wales in the UK): I've done Youth Work and we saw plenty of problems with stim based soda drinks like Monster. That was 4 or so years ago. The Welsh Government took it seriously enough to ban sales to under 16 year olds. Every tin, never mind the sugar and or sweetener, contains 150mg of caffeine. Most people (and esp kids) don't join the dots regarding both the stims and sweeteners and their effects (staying up late, poor sleep, sides in the morning, needing more of the same).
The same MUST apply to soda for both sugar and sweeteners and peoples responses to them). The way the first post was written and indeed a reply or two after (and as per other similar posts - which I remember when others do not - is people NEEDING something flavored. To the point where simple water, nothing added, is a no no. Isn't that kinda fucked?