you are getting to what i dislike the most. a distraction. with irons when it is critical - you draw and plant a shot. with a dot - you draw and then cannot stop but think, hmm, where is my dot there? ohh, here it is. ok. bang.
for most with a well practiced draw it means that your off shot with irons could have been 5-7 inches lower/higher before you adjusted it, but usually with not that much of the horizontal off. matters not on a human sized target at 15yds. with a dot - it may end up to be a no shot, as you will be thinking of where did the dot go. and, well, may be already dead by that time.
i never argue with facts - and it is a fact that once you got on a dot - the next target acquisition speed is much faster, it is way more accurate, all the good things.
if you carry for a duty, gun is always warm and clean - and check the status of the device religiously - why not.
but if one carries sporadically, gun sits in the dark safe with dot left 'always on' always - it is not going to end well, it is only logic. it will eventually either discharge mid-day, or will be forgotten to be turned off/on. but i think no matter what i say here the other side is on the stubborn mode now, so, to each their own.