Because when you use phrases like “just simply” [do something actually hard], your stakeholders read that and say things like, “why did this take a whole sprint

Because when you use phrases like “just simply” [do something actually hard], your stakeholders read that and say things like, “why did this take a whole sprint to implement? You said you just had to [do something hard].” There’s no reason to downplay the difficulty of your and your team’s work. Further, we’re adults, as you say, so let’s be adults and take the time to consider our readers position and how our writing might be interpreted. You’re doing no one any favors by refusing to be empathetic.