I emailed this question over to Rachio Support team and they told me 'Flex is for advanced users, we suggest using the fixed schedules' which wasn't what I was expecting.
So, I'll try here
I have brand new fruit trees, less than 2 months old now. It was watering them once every 6 days or so and I noticed that they weren't looking so good. I started looking into the settings and noticed that if I adjust allowed depletion, it will water more often.
So, I got to thinking that if the roots aren't very deep in these trees, we should be watering more. Am I wrong for thinking this? I changed it to 30% Allowed Depletion for now and it's watering every 3-4 days which seems better, but wanted input from the community.