You really have no clue do you. Air bubbles from a stone introduces little DO into the water from the bubbles them self, It' from the surface tension of the water being broken at the surface. I've left gallons for weeks and never bubbled my water before i used them with-out any problems, Why, because as soon as i start pouring i,m breaking the surface tension of the water and our good friend atmospheric pressure does the job of oxygenation.
And lets be honest, how many hand waters are going to sit there all day and constantly feed their plants.
Sure you can drown you're plants, but if you're running a free draining medium like coir fiber, water all you want. I have even used coir in a water farm and probable would still if it wasn't a pain to have to refill 3 or 4 time a day for the plants drinking it up.