No. It doesn't. Research that points to it being a good thing to avoid ever getting thirsty in the first place, is funded by companies that want to sell you water. Preferably bottled, at an inordinate markup.
Most people only notice their thirst due to their busy lives, by the time it gets really bad. But you get thirsty FAR in advance of it being an issue, it just isn't an insistent feeling.
Hydration trackers, at best, help people who keep busy to actually slow down for a sec and check the state of their body.
In reality, most people who don't get enough water, can solve their problem with one additionall glass with one of their daily meals.
An app is like downing the entire jar of vitamins when one pill a day would do the trick.
Hydration isn't an hour to hour issue. You don't sweat and piss liters a day. And you aren't supposed to either. Fad diet plans that actually work by losing waterweight, still show the weight loss over days, not hours.
Not drinking on a schedule does not risk dehydration.