An important missed angle is the effect of artificial sweeteners on gut microbiome. They cause intestinal inflammation which is relevant for IBD sufferers. My take is that I don't miss out on much by being conservative with food, as we still don't understand these complex interactions well enough. What's the harm in sticking to a balanced whole diet of ingredients that were available to our ancestors 200years or more…
As the article mentions, this is a false dichotomy. If you're an ordinary person driven to be healthy, drink water. Water is great. If you're already drinking water, you should absolutely not replace it with whatever bottled crap that Coke or Pepsi is peddling, be it "smart water" or otherwise. But for people with sugar cravings bordering on addiction, which describes a depressingly enormous proportion of the populat…
Another thing to watch out for is caffeine input which is often associated with sweetened drinks. Caffeine is a diuretic and you will see yourself drinking can after can of diet coke while not quite quenching your thirst or properly hydrating yourself. This is documented to lead to intense muscle pain and unexplained migraines for people who do physical work and abuse these types of drinks, and can't be good for your kidneys long term, even under the assumption that sweeteners are 100% safe.
Overall, just drink plenty of water and use everything else in moderation seems like a solid advice.